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Qt计算器

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Linux界面设计——Qt简单计算器课程名称：计算机基础综合课题分类：Qt界面设计班级：11计算机科学与技术2班姓名：段秉芮学号：1145532211完成时间：2014年01月01Qt计算器一.摘要当今社会是信息社会，科技经济高速发展的社会，为了更方便人们的工作生活和加速人们处理信息的速度，计算器应运而生。

然而，电脑已经成为当代人生活的必需品，运行在电脑上的计算器成为了人们的生活学习绝佳伴侣。

本设计是用C++编写的，基于Qt图形用户界面应用程序框架的计算器。

设计出两个电脑端和安卓手机端两个应用程序，并实现了一定的计算功能。

二．建立项目如下所示：首先在linux下softcenter安装Qt Creator或者在terminal中输入命令安装；sudo apt-get install libqt4-dev libqt4-debug libqt4-gui libqt4-sql qt4-dev-tools qt4-doc qt4-designer qt4-qtconfig比如qt4-dev-tools 包含了Qt Assistant及Qt Linguist等工具，因此不需要单独安装这两个工具。

其它的，qt4-doc 是帮助文档，包含了Qt中各个类库的详细说明以及丰富的例子程序，可以使用Qt Assistant 工具来打开阅读。

qt4-qtconfig 是配置Qt环境的一个对话框，一般默认就行了，很少有必要去更改。

qt4-demos 包含很多可以运行起来的可执行文件以及源代码。

qt4-designer是用来设计GUI界面的设计器sudo apt-get install libqt4-debug//sudo apt-get install libqt4-dbg安装完成打开。

1.创建工程选择File->New File or Project，然后如下所示，之后next。

之后在Details时候，选项Base class选中QWidget。

然后next至finish。

二．程序代码如下：1.建立calculator.h右键calculator项目，选择add new。

如下所示：calculator.h代码修改如下：#ifndef CALCULATOR_H#define CALCULATOR_H#include<QTextEdit>#include<QPushButton>#include<QAction>#include<QVector>class Calculator : public QWidget {Q_OBJECTpublic:Calculator(QWidget *parent = 0); ~Calculator();private:QTextEdit* screenTextEdit; QPushButton* button1; QPushButton* button2; QPushButton* button3; QPushButton* button4; QPushButton* button5; QPushButton* button6; QPushButton* button7; QPushButton* button8; QPushButton* button9; QPushButton* button0; QPushButton* buttonx; QPushButton* buttondivide; QPushButton* buttonadd; QPushButton* buttonsub; QPushButton* buttondot; QPushButton* buttonequal; QPushButton* buttonclear; QPushButton* buttonback; QPushButton* buttonLArc; QPushButton* buttonRArc; bool isEnter;double sum ;int i;int j;double result;bool isPoint;bool isLArc;char sign;bool isTwoOptrsFlag;bool isEqualClicked;int f1[7];int f2[7];QVector<double>vectorOpnd; QVector<char>vectorOptr; QVector<char>vectorExp;bool isTwoOptr(QPushButton *button);void initConnect();void initVector();double operate(double a, char theat, double b);char precedeSign(char optr1, char optr2);int char2num(char optr);void initData();char button2char(QPushButton *button);void getDigital(char digital);void getSign(char ch);bool pickSign(char ch);bool pushVector(char optr);void getResult();private slots:void getButton();void clearScreen();void myBackSpace();};#endif // CALCULATOR_H2.main.cpp修改如下：只需要将Widget w;w.show();修改为Calculator cal;cal.show();3.calculator.cpp建立calculator.cpp文件的过程和建立calculator.h的过程一样，只是选择C++ Source File选项。

calculator.cpp代码如下：#include "calculator.h"#include<QGridLayout>Calculator::Calculator(QWidget *parent): QWidget(parent){initData();setWindowTitle("计算器");setWindowIcon(QIcon(":/calculator.png"));screenTextEdit = new QTextEdit;screenTextEdit->setFixedHeight(50);screenTextEdit->setFont(QFont("Courier 10 Pitch", 18, QFont::Bold)); screenTextEdit->setReadOnly(true);button1 = new QPushButton("1");button2 = new QPushButton("2");button3 = new QPushButton("3");button4 = new QPushButton("4");button5 = new QPushButton("5");button6 = new QPushButton("6");button7 = new QPushButton("7");button8 = new QPushButton("8");button9 = new QPushButton("9");button0 = new QPushButton("0");buttonx = new QPushButton("×");buttonadd = new QPushButton("+");buttonsub = new QPushButton("-");buttonback = new QPushButton("back");buttondivide = new QPushButton("/");buttondot = new QPushButton(".");buttonLArc = new QPushButton("(");buttonRArc = new QPushButton(")");buttonequal = new QPushButton("=");buttonclear = new QPushButton("clear");initConnect();QGridLayout *gridLayout = new QGridLayout;gridLayout->addWidget(screenTextEdit, 0, 0, 2, 5);gridLayout->addWidget(button1, 2, 0, 1, 1);gridLayout->addWidget(button2, 2, 1, 1 ,1);gridLayout->addWidget(button3, 2, 2, 1, 1);gridLayout->addWidget(buttonadd, 2, 3, 1, 1);gridLayout->addWidget(buttonsub, 2, 4, 1, 1);gridLayout->addWidget(button4, 3, 0, 1, 1);gridLayout->addWidget(button5, 3, 1, 1, 1);gridLayout->addWidget(button6, 3, 2, 1, 1);gridLayout->addWidget(buttonx, 3, 3, 1, 1);gridLayout->addWidget(buttondivide, 3, 4, 1, 1);gridLayout->addWidget(button7, 4, 0, 1, 1);gridLayout->addWidget(button8, 4, 1, 1, 1);gridLayout->addWidget(button9, 4, 2, 1, 1);gridLayout->addWidget(buttonLArc, 4, 3, 1, 1);gridLayout->addWidget(buttonRArc, 4, 4, 1, 1);gridLayout->addWidget(button0, 5, 0, 1, 1);gridLayout->addWidget(buttondot, 5, 1, 1, 1);gridLayout->addWidget(buttonback, 5, 2, 1, 1);gridLayout->addWidget(buttonclear, 5, 3, 1, 1);gridLayout->addWidget(buttonequal, 5, 4, 1, 1);setLayout(gridLayout);initVector();}void Calculator::initConnect(){connect(button0, &QPushButton::clicked, this, &Calculator::getButton); connect(button1, &QPushButton::clicked, this, &Calculator::getButton); connect(button2, &QPushButton::clicked, this, &Calculator::getButton); connect(button3, &QPushButton::clicked, this, &Calculator::getButton); connect(button4, &QPushButton::clicked, this, &Calculator::getButton); connect(button5, &QPushButton::clicked, this, &Calculator::getButton); connect(button6, &QPushButton::clicked, this, &Calculator::getButton); connect(button7, &QPushButton::clicked, this, &Calculator::getButton); connect(button8, &QPushButton::clicked, this, &Calculator::getButton); connect(button9, &QPushButton::clicked, this, &Calculator::getButton); connect(buttonx, &QPushButton::clicked, this, &Calculator::getButton); connect(buttonadd, &QPushButton::clicked, this, &Calculator::getButton); connect(buttondivide, &QPushButton::clicked, this, &Calculator::getButton); connect(buttondot, &QPushButton::clicked, this, &Calculator::getButton); connect(buttonsub, &QPushButton::clicked, this, &Calculator::getButton); connect(buttonRArc, &QPushButton::clicked, this, &Calculator::getButton); connect(buttonLArc, &QPushButton::clicked, this, &Calculator::getButton); connect(buttonback, &QPushButton::clicked, this, &Calculator::myBackSpace); connect(buttonclear, &QPushButton::clicked, this, &Calculator::clearScreen); connect(buttonequal, &QPushButton::clicked, this, &Calculator::getButton); }bool Calculator::isTwoOptr(QPushButton *button){if(button == buttonadd || button ==buttonsub|| button == buttonx || button == buttondivide)return true;elsereturn false;}void Calculator::myBackSpace(){QTextCursor cursor = screenTextEdit->textCursor();cursor.deletePreviousChar();if(!isEqualClicked)vectorExp.pop_back();}void Calculator::getButton(){QPushButton* button = qobject_cast<QPushButton*>(sender()); if(isTwoOptrsFlag && isTwoOptr(button)){}else{vectorExp.append(button2char(button));isEqualClicked = false;isTwoOptrsFlag = false;if(!isEnter)screenTextEdit->append("");screenTextEdit->insertPlainText(button->text());isEnter = true;if(button == buttonadd || button == buttonsub|| button == buttonx || button == buttondivide) isTwoOptrsFlag = true;}if(button == buttonequal){isEqualClicked = true;getResult();}}void Calculator::getResult(){while(!vectorExp.isEmpty()){char ch = vectorExp.first();vectorExp.removeFirst();getDigital(ch);getSign(ch);}}void Calculator::getDigital(char digital){if(digital == '0' || digital == '1' || digital == '2'|| digital == '3' || digital == '4' || digital == '5'|| digital == '6' || digital == '7' || digital == '8'|| digital == '9' ){if(isPoint)i *= 10;j = 0;sum = sum * 10 + (digital - '0');isLArc = false;}else if(digital == '.'){isPoint = true;isLArc = false;}}void Calculator::getSign(char ch){if(isLArc && ch != '(' && ch != ')'){sign = ch;}else if(ch == '+' || ch == '-'|| ch == '*' || ch == '/'|| ch == '=' || ch == '('|| ch == ')'){if(ch == '(')isLArc = true;elseisLArc = false;j++;if(j <=1){if(sign == '-')sum = sum * (-1);sign = ' ';vectorOpnd.append(sum / i);isLArc = false;i = 1;sum = 0;isPoint = false;}pickSign(ch);}}bool Calculator::pickSign(char ch){char theta;double a, b;if(ch == '='){while(st() != '#'){do{theta = st();vectorOptr.pop_back();}while(theta == '(' || theta == ')');if(theta != '#')//void 8(,9),8(){b = st();vectorOpnd.pop_back();a = st();vectorOpnd.pop_back();vectorOpnd.append(operate(a, theta, b));}else if(theta == '#')vectorOptr.append('#');}result = st();screenTextEdit->insertPlainText(QString("%1").arg(result));vectorOpnd.clear();vectorOptr.clear();initVector();isEnter = false;return true;}pushVector(ch);return true;}bool Calculator::pushVector(char optr){char theta;double a, b;if(optr == ')'){do{theta = st();vectorOptr.pop_back();}while(theta == '(' || theta == ')');if(theta != '#')// void 8(,9),8(){b = st();vectorOpnd.pop_back();a = st();vectorOpnd.pop_back();vectorOpnd.append(operate(a, theta, b));}else{vectorOptr.append('#');}return true;}switch(precedeSign(st(),optr)){case '<':vectorOptr.append(optr);break;case '=':vectorOptr.pop_back();break;case '>':theta = st();vectorOptr.pop_back();b = st();vectorOpnd.pop_back();a = st();vectorOpnd.pop_back();vectorOpnd.append(operate(a, theta, b));vectorOptr.append(optr);break;}return true;}void Calculator::clearScreen(){screenTextEdit->clear();result = 0;isEnter = true;}double Calculator::operate(double a, char theta, double b) {double sum1;switch (theta) {case '+':sum1 = a + b; break;case '-':sum1 = a - b; break;case '*':sum1 = a * b; break;case '/':sum1 = a / b; break;}return sum1;}char Calculator::button2char(QPushButton *button){char optr;if(button == buttonadd)optr = '+';else if(button == buttonsub)optr = '-';else if(button == buttonx)optr = '*';else if(button == buttondivide)optr = '/';else if(button == buttonLArc)optr = '(';else if(button == buttonRArc)optr = ')';else if(button == buttonequal)optr = '=';else if(button == button0)optr = '0';else if(button == button1)optr = '1';else if(button == button2)optr = '2';else if(button == button3)optr = '3';else if(button == button4)optr = '4';else if(button == button5)optr = '5';else if(button == button6)optr = '6';else if(button == button7)optr = '7';else if(button == button8)optr = '8';else if(button == button9)optr = '9';else if(button == buttondot)optr = '.';return optr;}char Calculator::precedeSign(char optr1, char optr2) {char compare;int i1 = char2num(optr1);int i2 = char2num(optr2);if(f1[i1] > f2[i2])compare = '>';else if(f1[i1] < f2[i2])compare = '<';elsecompare = '=';return compare;}int Calculator::char2num(char optr)int ii;switch(optr){case '+':ii = 0; break;case '-':ii = 1; break;case '*':ii = 2; break;case '/':ii = 3; break;case '(':ii = 4; break;case ')':ii = 5; break;default:ii = 6;}return ii;}void Calculator::initData(){i = 1;j = 0;sum = 0;f1[0] = f1[1] =3; f1[2] = f1[3] = 5; f1[4] = 1; f1[5] = 6; f1[6] = 0;f2[0] = f2[1] = 2; f2[2] = f2[3] = 4; f2[4] = 6; f2[5] = 1; f2[6] = 0;isPoint = false;isLArc = false;sign = ' ';isTwoOptrsFlag = false;isEqualClicked = false;isEnter = true;}void Calculator::initVector(){vectorOptr.append('#');vectorOpnd.append(0);vectorOpnd.append(0);vectorOpnd.append(0);Calculator::~Calculator() {}三．程序运行结果如下：四．总结通过计算器设计，学到了利用Qt设计简单窗口应用程序的的方法，初步了解了使用QT 工具编写窗口程序的新颖，了解了槽和信号等基本知识，学会了如何使用新工具（Qt）帮助程序开发。

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基于QT的计算器程序

基于QT的计算器程序

button[7]=new QPushButton(tr("*"));
button[7]->setFont( QFont( "Times",10, QFont::Bold ) );
button[8]=new QPushButton(tr("7"));
button[9]=new QPushButton(tr("8"));
button[17]=new QPushButton(tr("Clear"));
button[18]=new QPushButton(tr("="));
lineedit = new QLineEdit; //声明行编辑器空间
lineedit->setMaxLength(16); //最多9位数
//label[0]=new QLabel(tr("编辑"));
QHBoxLayout *toplayout = new QHBoxLayout;
toplayout->addWidget(jisuanlabel);
toplayout->addWidget(lineedit);
QHBoxLayout *line1 = new QHBoxLayout;
QHBoxLayout *line2 = new QHBoxLayout;
date2=0;//第二个计算数清零
jieguo=0;//计算结果清零
}
}
coutinuous=1;
}
void jisuan::equal() //等于槽
{
floatflag=0;//浮点标志清零
floatcount=0;//浮点位数清零
嵌入式系统之基于QT的简单计算器

嵌入式系统之基于QT的简单计算器

嵌入式系统之基于QT的简单计算器QT是一种跨平台的应用程序开发框架，它提供了一种编写图形用户界面(GUI)程序的简便方法。

在嵌入式系统中，使用QT可以快速开发出各种功能强大、界面友好的应用程序。

对于一个简单计算器来说，主要包括用户界面设计和计算逻辑两部分。

首先，我们需要设计一个界面来展示计算器的按钮和显示结果的区域。

在QT中，可以使用QGridLayout布局管理器来创建按钮布局，同时将其连接到对应的信号槽函数上，以实现按钮的点击响应。

```cpp//main.qmlimport QtQuick 2.12import QtQuick.Window 2.12import QtQuick.Controls 2.12Windowvisible: truewidth: 400height: 600title: "Simple Calculator"RowLayoutspacing: 10GridLayoutid: buttonGridrows: 4columns: 4anchors.horizontalCenter: parent.horizontalCenter anchors.verticalCenter: parent.verticalCenter Buttontext: "7"onClicked: calculator.append("7")}Buttontext: "8"onClicked: calculator.append("8")}// ... more buttons ...Buttontext: "="onClicked: calculator.calculate}// ... more buttons ...}TextFieldid: resultFieldwidth: 200height: 50placeholderText: "0"readOnly: true}}```在这个示例中，我们使用了QT的QML语言来创建用户界面。

qt编程简单的计算器

qt编程简单的计算器

QT编程实现简易的计算器一、实验目的1) 熟悉QtCreator的简单操作。

2) 了解Qt程序编写框架。

3) 了解信号和槽机制，熟练掌握信号与槽在应用程序中的使用。

二、实验内容1) 查看API手册，学习简单的Qt类的使用，如QLineEdit、QPushButton等。

2) 用QtCreator创建工程，用Qt编写计算器程序。

3) 对计算器程序进行移植。

三、实验步骤1. 创建工程1) 打开QtCreator，如图1所示。

选择File->New File or Project，然后在弹出的对话框中选择Other Project->Empty Qt project （如图2所示），然后进入下一步。

选择Qt版本，这里选择使用Qt4.7.1，取消对Qt in PA TH的选择（如图4所示），然后进入下一步，完成新工程的创建（如图5所示）。

实现代码Calcuulator.h代码：#ifndef CALCULATOR_H#define CALCULATOR_H#include<QApplication>#include<QDialog>#include<QPushButton>#include<QLineEdit>class Calculator:public QDialog {Q_OBJECT protected:QLineEdit *lineEditor; QPushButton *button_0; QPushButton *button_1; QPushButton *button_2; QPushButton *button_3; QPushButton *button_4; QPushButton *button_5; QPushButton *button_6; QPushButton *button_7; QPushButton *button_8; QPushButton *button_9; QPushButton *button_ce; QPushButton *button_jia; QPushButton *button_jian; QPushButton *button_cheng; QPushButton *button_chu; QPushButton *button__; QPushButton *button_dengyu; int num1,num2,result; // bool zhenghao; //int mark; //char fuhao; //QString S; //public:Calculator();private slots:void button_0_clicked();void button_1_clicked();void button_2_clicked();void button_3_clicked();void button_4_clicked();void button_5_clicked();void button_6_clicked();void button_7_clicked();void button_8_clicked();void button_9_clicked();void button_ce_clicked();void button_jia_clicked();void button_jian_clicked();void button_cheng_clicked();void button_chu_clicked();void button__clicked();void button_dengyu_clicked(); };#endif // CALCULATOR_HCalculator.cpp代码：#include<QLayout>#include<QHBoxLayout>#include<QVBoxLayout>#include<QLineEdit>#include<cmath>#include"calculator.h"Calculator::Calculator(){num1=0;num2=0;result=0;zhenghao=true;mark=1;lineEditor=new QLineEdit("0");S="";button_0=new QPushButton("0");button_1=new QPushButton("1");button_2=new QPushButton("2");button_3=new QPushButton("3");button_4=new QPushButton("4");button_5=new QPushButton("5"); button_6=new QPushButton("6"); button_7=new QPushButton("7"); button_8=new QPushButton("8"); button_9=new QPushButton("9"); button_ce=new QPushButton("CE"); button_cheng=new QPushButton("*"); button_jia=new QPushButton("+"); button_jian=new QPushButton("-"); button_chu=new QPushButton("/"); button__=new QPushButton("+/-"); button_dengyu=new QPushButton("="); QHBoxLayout *Hl1=new QHBoxLayout; QHBoxLayout *Hl2=new QHBoxLayout; QHBoxLayout *Hl3=new QHBoxLayout; QHBoxLayout *Hl4=new QHBoxLayout; QHBoxLayout *Hl5=new QHBoxLayout; Hl1->addWidget(lineEditor);Hl1->addWidget(button_ce);Hl2->addWidget(button_1);Hl2->addWidget(button_2);Hl2->addWidget(button_3);Hl2->addWidget(button_jia);Hl3->addWidget(button_4);Hl3->addWidget(button_5);Hl3->addWidget(button_6);Hl3->addWidget(button_jian);Hl4->addWidget(button_7);Hl4->addWidget(button_8);Hl4->addWidget(button_9);Hl4->addWidget(button_cheng);Hl5->addWidget(button__);Hl5->addWidget(button_0);Hl5->addWidget(button_dengyu);Hl5->addWidget(button_chu);QVBoxLayout *V1=new QVBoxLayout;V1->addLayout(Hl1);V1->addLayout(Hl2);V1->addLayout(Hl3);V1->addLayout(Hl4);V1->addLayout(Hl5);connect(button_0,SIGNAL(clicked()),this,SLOT(button_0_clicked())); connect(button_1,SIGNAL(clicked()),this,SLOT(button_1_clicked())); connect(button_2,SIGNAL(clicked()),this,SLOT(button_2_clicked()));connect(button_3,SIGNAL(clicked()),this,SLOT(button_3_clicked()));connect(button_4,SIGNAL(clicked()),this,SLOT(button_4_clicked()));connect(button_5,SIGNAL(clicked()),this,SLOT(button_5_clicked()));connect(button_6,SIGNAL(clicked()),this,SLOT(button_6_clicked()));connect(button_7,SIGNAL(clicked()),this,SLOT(button_7_clicked()));connect(button_8,SIGNAL(clicked()),this,SLOT(button_8_clicked()));connect(button_9,SIGNAL(clicked()),this,SLOT(button_9_clicked()));connect(button_jia,SIGNAL(clicked()),this,SLOT(button_jia_clicked()));connect(button_jian,SIGNAL(clicked()),this,SLOT(button_jian_clicked()));connect(button_cheng,SIGNAL(clicked()),this,SLOT(button_cheng_clicked()));connect(button_chu,SIGNAL(clicked()),this,SLOT(button_chu_clicked()));connect(button_dengyu,SIGNAL(clicked()),this,SLOT(button_dengyu_clicked()));connect(button_ce,SIGNAL(clicked()),this,SLOT(button_ce_clicked()));connect(button__,SIGNAL(clicked()),this,SLOT(button__clicked()));setLayout(V1);}void Calculator::button_0_clicked(){S+="0";lineEditor->setText(S);if(mark==1){num1=num1*10+0;}else{num2=num2*10;}}void Calculator::button_1_clicked(){ S+="1";lineEditor->setText(S);if(mark==1){if(zhenghao){num1=num1*10+1;}else{num1=num1*10-1;}}else{if(zhenghao){num2=num2*10+1;}else{num2=num2*10-1;}}}void Calculator::button_2_clicked(){lineEditor->setText(S);if(mark==1){if(zhenghao){num1=num1*10+2;}else{num1=num1*10-2;}}else{if(zhenghao){num2=num2*10+2;}else{num2=num2*10-2;}}}void Calculator::button_3_clicked(){ S+="3";lineEditor->setText(S);if(mark==1){if(zhenghao){num1=num1*10+3;num1=num1*10-3;}}else{if(zhenghao){num2=num2*10+3;}else{num2=num2*10-3;}}}void Calculator::button_4_clicked(){ S+="4";lineEditor->setText(S);if(mark==1){if(zhenghao){num1=num1*10+4;}else{num1=num1*10-4;}}else{if(zhenghao){num2=num2*10+4;}else{num2=num2*10-4;}}}void Calculator::button_5_clicked(){ S+="5";lineEditor->setText(S);if(mark==1){if(zhenghao){num1=num1*10+5;}else{num1=num1*10-5;}}else{if(zhenghao){num2=num2*10+5;}else{num2=num2*10-5;}}}void Calculator::button_6_clicked(){ S+="6";lineEditor->setText(S);if(mark==1){if(zhenghao){num1=num1*10+6;}else{num1=num1*10-6;}}else{if(zhenghao){num2=num2*10+6;}else{num2=num2*10-6;}}}void Calculator::button_7_clicked(){ S+="7";lineEditor->setText(S);if(mark==1){if(zhenghao){num1=num1*10+7;}else{num1=num1*10-7;}}else{if(zhenghao){num2=num2*10+7;}else{num2=num2*10-7;}}}void Calculator::button_8_clicked(){ S+="8";lineEditor->setText(S);if(mark==1){if(zhenghao){num1=num1*10+8;}else{num1=num1*10-8;}if(zhenghao){num2=num2*10+8;}else{num2=num2*10-8;}}}void Calculator::button_9_clicked(){ S+="9";lineEditor->setText(S);if(mark==1){if(zhenghao){num1=num1*10+9;}else{num1=num1*10-9;}}else{if(zhenghao){num2=num2*10+9;}else{num2=num2*10-9;}}void Calculator::button_jia_clicked(){ S+="+";lineEditor->setText(S);zhenghao=true;fuhao='+';mark=2;}void Calculator::button_jian_clicked(){ S+="-";lineEditor->setText(S);zhenghao=true;fuhao='-';mark=2;}void Calculator::button_cheng_clicked(){ S+="*";lineEditor->setText(S);zhenghao=true;fuhao='*';}void Calculator::button_chu_clicked(){S+="/";lineEditor->setText(S);zhenghao=true;fuhao='/';mark=2;}void Calculator::button__clicked(){S+="-";lineEditor->setText(S);zhenghao=false;}void Calculator::button_dengyu_clicked(){ S+="=";// lineEditor->setText(S);switch(fuhao){case '+':result=num1+num2;break;case '-':result=num1-num2;break;case '*':result=num1*num2;break;case '/':if(num2)result=num1/num2;break;}int i=0;int result1=result;while(result1){i++;result1/=10;}for(;i;i--){S+=(result/(int)pow(10,i-1)+'0');result%=(int)pow(10,i-1);}lineEditor->setText(S);zhenghao=true;num1=num2=0;mark=1;S="";}void Calculator::button_ce_clicked(){zhenghao=false;S="";lineEditor->setText("0");num1=num2=0;mark=1;}Main代码：#include"calculator.h"int main(int argc,char *argv[]) {QApplication app(argc,argv);Calculator cal;cal.show();return app.exec();}运行结果四、总结通过计算器设计，学到了利用Qt设计简单窗口应用程序的的方法，初步了解了使用QT工具编写窗口程序的新颖，了解了槽和信号等基本知识，学会了如何使用新工具（Qt）帮助程序开发。

qt5计算器代码

qt5计算器代码

Qt计算器源代码caculator.h头文件#ifndef CACULATOR_H#define CACULATOR_H#include <QDialog>#include <QLineEdit>#include <QPushButton>#include <QCloseEvent>#include <QKeyEvent>#include <QMessageBox>#include <QDebug>#include <QGridLayout>#include <QStack>#include "math.h"namespace Ui {class Caculator;}class Caculator : public QDialog{Q_OBJECTpublic:explicit Caculator(QWidget *parent = 0);~Caculator();void widgetInitial();//初始化控件void widgetLayout();//设置窗口布局void pushButtonStyle(QPushButton *pushButton);//设置按钮样式void lineEditStyle(QLineEdit *lineEdit,int height);//设置输入框样式void setNumber(int num);//设置数字void setOperation(int oper);//设置+、-、*、/、.、)等符号void caculate(int cacu);//计算x^2、x^3、sin、cos、tan等long factorial(int num);//计算阶乘//中缀转换为后缀表达式int toPostfix(const char *S,char OPS[],int &len);//计算后缀表达式int evaluation (char B[], int len, double &result,bool &flag);protected:void closeEvent(QCloseEvent *event);//窗口关闭事件void keyPressEvent(QKeyEvent *key);//按键事件private:Ui::Caculator *ui;//计算器相关控件QLineEdit *showTextEdit; //表达式显示栏QLineEdit *showResultEdit; //结果显示栏QPushButton *backBtn; //回退QPushButton *ceBtn; //清除QPushButton *clearBtn; //清空QPushButton *oneBtn;QPushButton *twoBtn;QPushButton *threeBtn;QPushButton *fourBtn;QPushButton *fiveBtn;QPushButton *sixBtn;QPushButton *sevenBtn;QPushButton *eightBtn;QPushButton *nineBtn;QPushButton *zeroBtn;QPushButton *pointBtn; //.QPushButton *left_bracket; //(QPushButton *right_bracket; //)//内存管理QPushButton *clearMemoryBtn; //创建清除内存按钮QPushButton *readMemoryBtn; //创建读内存按钮QPushButton *setMemoryBtn; //创建设置内存按钮//运算QPushButton *signBtn; //+/-QPushButton *addBtn;QPushButton *subBtn;QPushButton *mulBtn;QPushButton *divideBtn;QPushButton *sqrtBtn; //开方QPushButton *squBtn; //平方QPushButton *cubeBtn; //立方QPushButton *logBtn;QPushButton *recipBtn; //倒数QPushButton *factBtn; //阶乘QPushButton *sinBtn;QPushButton *cosBtn;QPushButton *tanBtn;QPushButton *InBtn; //对数QPushButton *tenxBtn;QPushButton *expBtn;QPushButton *sinhBtn;QPushButton *coshBtn;QPushButton *tanhBtn;QPushButton *xyBtn; //x^yQPushButton *modBtn; //取模QPushButton *equalBtn;double sumMemory;private slots://按钮所关联的槽函数void clearMemoryBtnSlot();void readMemoryBtnSlot();void setMemoryBtnSlot();void signBtnSlot();void sqrtBtnSlot();void sinBtnSlot();void backBtnSlot();void ceBtnSlot();void clearBtnSlot();void squBtnSlot();void cosBtnSlot();void sevenBtnSlot();void eightBtnSlot();void nineBtnSlot();void divideBtnSlot();void cubeBtnSlot();void tanBtnSlot();void fourBtnSlot();void fiveBtnSlot();void sixBtnSlot();void mulBtnSlot();void logBtnSlot();void InBtnSlot();void oneBtnSlot();void twoBtnSlot();void threeBtnSlot();void subBtnSlot();void recipBtnSlot();void tenxBtnSlot();void zeroBtnSlot();void pointBtnSlot();void addBtnSlot();void factBtnSlot();void equalBtnSlot();void expBtnSlot();void sinhBtnSlot();void coshBtnSlot();void tanhBtnSlot();void xyBtnSlot();void modBtnSlot();void left_bracketSlot();void right_bracketSlot();};#endif // CACULATOR_Hcaculator.cpp源文件#include "caculator.h"#include "ui_caculator.h"Caculator::Caculator(QWidget *parent) :QDialog(parent),ui(new Ui::Caculator){ui->setupUi(this);this->widgetInitial();this->widgetLayout();}Caculator::~Caculator(){delete ui;}//初始化控件void Caculator::widgetInitial(){this->setWindowFlags(Qt::WindowCloseButtonHint);this->setWindowTitle("计算器");this->setFixedSize(this->width(),this->height());showTextEdit=new QLineEdit(this);showTextEdit->setText("");showResultEdit=new QLineEdit(this); showResultEdit->setText("0");backBtn=new QPushButton(this); backBtn->setText("←");ceBtn=new QPushButton(this);ceBtn->setText("CE");clearBtn=new QPushButton(this); clearBtn->setText("C");oneBtn=new QPushButton(this);oneBtn->setText("1");twoBtn=new QPushButton(this);twoBtn->setText("2");threeBtn=new QPushButton(this); threeBtn->setText("3");fourBtn=new QPushButton(this); fourBtn->setText("4");fiveBtn=new QPushButton(this);fiveBtn->setText("5");sixBtn=new QPushButton(this);sixBtn->setText("6");sevenBtn=new QPushButton(this); sevenBtn->setText("7");eightBtn=new QPushButton(this); eightBtn->setText("8");nineBtn=new QPushButton(this); nineBtn->setText("9");zeroBtn=new QPushButton(this); zeroBtn->setText("0");pointBtn=new QPushButton(this); pointBtn->setText("."); clearMemoryBtn=new QPushButton(this); clearMemoryBtn->setText("MC"); readMemoryBtn=new QPushButton(this); readMemoryBtn->setText("MR"); setMemoryBtn=new QPushButton(this); setMemoryBtn->setText("MS"); signBtn=new QPushButton(this); signBtn->setText("\302\261");addBtn=new QPushButton(this);addBtn->setText("+");subBtn=new QPushButton(this);subBtn->setText("-");mulBtn=new QPushButton(this);mulBtn->setText("*");divideBtn=new QPushButton(this); divideBtn->setText("/");right_bracket=new QPushButton(this); right_bracket->setText(")");left_bracket=new QPushButton(this); left_bracket->setText("(");sqrtBtn=new QPushButton(this); sqrtBtn->setText("√");squBtn=new QPushButton(this); squBtn->setText("x²");cubeBtn=new QPushButton(this); cubeBtn->setText("x³");logBtn=new QPushButton(this); logBtn->setText("log");recipBtn=new QPushButton(this); recipBtn->setText("1/x");factBtn=new QPushButton(this); factBtn->setText("n!");sinBtn=new QPushButton(this); sinBtn->setText("sin");cosBtn=new QPushButton(this); cosBtn->setText("cos");tanBtn=new QPushButton(this); tanBtn->setText("tan");InBtn=new QPushButton(this);InBtn->setText("In");tenxBtn=new QPushButton(this); tenxBtn->setText("10^x");expBtn=new QPushButton(this); expBtn->setText("Exp");sinhBtn=new QPushButton(this); sinhBtn->setText("sinh");coshBtn=new QPushButton(this); coshBtn->setText("cosh");tanhBtn=new QPushButton(this); tanhBtn->setText("tanh");xyBtn=new QPushButton(this); xyBtn->setText("x^y");modBtn=new QPushButton(this); modBtn->setText("Mod");equalBtn=new QPushButton(this); equalBtn->setText("="); sumMemory=0.0;//设置样式lineEditStyle(showTextEdit,30); lineEditStyle(showResultEdit,30); pushButtonStyle(clearMemoryBtn); pushButtonStyle(readMemoryBtn); pushButtonStyle(setMemoryBtn); pushButtonStyle(signBtn); pushButtonStyle(sqrtBtn); pushButtonStyle(sinBtn); pushButtonStyle(backBtn); pushButtonStyle(ceBtn); pushButtonStyle(clearBtn); pushButtonStyle(squBtn); pushButtonStyle(cosBtn); pushButtonStyle(left_bracket); pushButtonStyle(right_bracket); pushButtonStyle(sevenBtn); pushButtonStyle(eightBtn); pushButtonStyle(nineBtn); pushButtonStyle(divideBtn); pushButtonStyle(cubeBtn); pushButtonStyle(tanBtn); pushButtonStyle(fourBtn); pushButtonStyle(fiveBtn); pushButtonStyle(sixBtn); pushButtonStyle(mulBtn); pushButtonStyle(logBtn); pushButtonStyle(InBtn); pushButtonStyle(oneBtn); pushButtonStyle(twoBtn); pushButtonStyle(threeBtn); pushButtonStyle(subBtn); pushButtonStyle(recipBtn); pushButtonStyle(tenxBtn); pushButtonStyle(zeroBtn); pushButtonStyle(pointBtn); pushButtonStyle(addBtn); pushButtonStyle(factBtn); pushButtonStyle(equalBtn); pushButtonStyle(expBtn); pushButtonStyle(sinhBtn); pushButtonStyle(coshBtn); pushButtonStyle(tanhBtn); pushButtonStyle(xyBtn);pushButtonStyle(modBtn);//关联信号和槽connect(clearMemoryBtn,SIGNAL(clicked(bool)),this,SLOT(clearMemoryBtnSlot()) );connect(readMemoryBtn,SIGNAL(clicked(bool)),this,SLOT(readMemoryBtnSlot())); connect(setMemoryBtn,SIGNAL(clicked(bool)),this,SLOT(setMemoryBtnSlot()));connect(signBtn,SIGNAL(clicked(bool)),this,SLOT(signBtnSlot()));connect(sqrtBtn,SIGNAL(clicked(bool)),this,SLOT(sqrtBtnSlot()));connect(sinBtn,SIGNAL(clicked(bool)),this,SLOT(sinBtnSlot()));connect(backBtn,SIGNAL(clicked(bool)),this,SLOT(backBtnSlot()));connect(ceBtn,SIGNAL(clicked(bool)),this,SLOT(ceBtnSlot()));connect(clearBtn,SIGNAL(clicked(bool)),this,SLOT(clearBtnSlot()));connect(squBtn,SIGNAL(clicked(bool)),this,SLOT(squBtnSlot()));connect(cosBtn,SIGNAL(clicked(bool)),this,SLOT(cosBtnSlot()));connect(left_bracket,SIGNAL(clicked(bool)),this,SLOT(left_bracketSlot()));connect(right_bracket,SIGNAL(clicked(bool)),this,SLOT(right_bracketSlot()));connect(sevenBtn,SIGNAL(clicked(bool)),this,SLOT(sevenBtnSlot()));connect(eightBtn,SIGNAL(clicked(bool)),this,SLOT(eightBtnSlot()));connect(nineBtn,SIGNAL(clicked(bool)),this,SLOT(nineBtnSlot()));connect(divideBtn,SIGNAL(clicked(bool)),this,SLOT(divideBtnSlot()));connect(cubeBtn,SIGNAL(clicked(bool)),this,SLOT(cubeBtnSlot()));connect(tanBtn,SIGNAL(clicked(bool)),this,SLOT(tanBtnSlot()));connect(fourBtn,SIGNAL(clicked(bool)),this,SLOT(fourBtnSlot()));connect(fiveBtn,SIGNAL(clicked(bool)),this,SLOT(fiveBtnSlot()));connect(sixBtn,SIGNAL(clicked(bool)),this,SLOT(sixBtnSlot()));connect(mulBtn,SIGNAL(clicked(bool)),this,SLOT(mulBtnSlot()));connect(logBtn,SIGNAL(clicked(bool)),this,SLOT(logBtnSlot()));connect(InBtn,SIGNAL(clicked(bool)),this,SLOT(InBtnSlot()));connect(oneBtn,SIGNAL(clicked(bool)),this,SLOT(oneBtnSlot()));connect(twoBtn,SIGNAL(clicked(bool)),this,SLOT(twoBtnSlot()));connect(threeBtn,SIGNAL(clicked(bool)),this,SLOT(threeBtnSlot()));connect(subBtn,SIGNAL(clicked(bool)),this,SLOT(subBtnSlot()));connect(recipBtn,SIGNAL(clicked(bool)),this,SLOT(recipBtnSlot()));connect(tenxBtn,SIGNAL(clicked(bool)),this,SLOT(tenxBtnSlot()));connect(zeroBtn,SIGNAL(clicked(bool)),this,SLOT(zeroBtnSlot()));connect(pointBtn,SIGNAL(clicked(bool)),this,SLOT(pointBtnSlot()));connect(addBtn,SIGNAL(clicked(bool)),this,SLOT(addBtnSlot()));connect(factBtn,SIGNAL(clicked(bool)),this,SLOT(factBtnSlot()));connect(equalBtn,SIGNAL(clicked(bool)),this,SLOT(equalBtnSlot()));connect(expBtn,SIGNAL(clicked(bool)),this,SLOT(expBtnSlot()));connect(sinhBtn,SIGNAL(clicked(bool)),this,SLOT(sinhBtnSlot()));connect(coshBtn,SIGNAL(clicked(bool)),this,SLOT(coshBtnSlot()));connect(tanhBtn,SIGNAL(clicked(bool)),this,SLOT(tanhBtnSlot()));connect(xyBtn,SIGNAL(clicked(bool)),this,SLOT(xyBtnSlot()));connect(modBtn,SIGNAL(clicked(bool)),this,SLOT(modBtnSlot())); }//设置窗口布局void Caculator::widgetLayout(){QGridLayout *mainLayout = new QGridLayout(this);//网格布局mainLayout->setSizeConstraint(QLayout::SetFixedSize);mainLayout->addWidget(showTextEdit , 0,0 ,1 ,7);mainLayout->addWidget(showResultEdit,1,0,1,7);mainLayout->addWidget(clearMemoryBtn,2,0);mainLayout->addWidget(readMemoryBtn,2,1);mainLayout->addWidget(setMemoryBtn,2,2);mainLayout->addWidget(signBtn,2,3);mainLayout->addWidget(sqrtBtn,2,4);mainLayout->addWidget(sinBtn,2,5);mainLayout->addWidget(sinhBtn,2,6);mainLayout->addWidget(backBtn,3,0);mainLayout->addWidget(ceBtn,3,1);mainLayout->addWidget(clearBtn,3,2);mainLayout->addWidget(divideBtn,3,3);mainLayout->addWidget(squBtn,3,4);mainLayout->addWidget(cosBtn,3,5);mainLayout->addWidget(coshBtn,3,6);mainLayout->addWidget(sevenBtn,4,0);mainLayout->addWidget(eightBtn,4,1);mainLayout->addWidget(nineBtn,4,2);mainLayout->addWidget(mulBtn,4,3);mainLayout->addWidget(cubeBtn,4,4);mainLayout->addWidget(tanBtn,4,5);mainLayout->addWidget(tanhBtn,4,6);mainLayout->addWidget(fourBtn,5,0);mainLayout->addWidget(fiveBtn,5,1);mainLayout->addWidget(sixBtn,5,2);mainLayout->addWidget(subBtn,5,3);mainLayout->addWidget(logBtn,5,4);mainLayout->addWidget(InBtn,5,5);mainLayout->addWidget(xyBtn,5,6);mainLayout->addWidget(oneBtn,6,0);mainLayout->addWidget(twoBtn,6,1);mainLayout->addWidget(threeBtn,6,2);mainLayout->addWidget(addBtn,6,3);mainLayout->addWidget(recipBtn,6,4);mainLayout->addWidget(tenxBtn,6,5);mainLayout->addWidget(modBtn,6,6);mainLayout->addWidget(zeroBtn,7,0);mainLayout->addWidget(pointBtn,7,1);mainLayout->addWidget(left_bracket,7,2);mainLayout->addWidget(right_bracket,7,3);mainLayout->addWidget(factBtn,7,4);mainLayout->addWidget(expBtn,7,5);mainLayout->addWidget(equalBtn,7,6);}//按钮样式void Caculator::pushButtonStyle(QPushButton *pushButton){QFont font("宋体",12);font.setBold(true);QString styleStr="border:1px solid gray;border-radius:5px;";pushButton->setStyleSheet(styleStr);pushButton->setFont(font);pushButton->setFixedSize(45,35);}//输入框样式void Caculator::lineEditStyle(QLineEdit *lineEdit,int height){QFont font("宋体",14);font.setBold(true);QString styleStr="border:1px solid gray;border-radius:10px;";lineEdit->setStyleSheet(styleStr);lineEdit->setReadOnly(true);lineEdit->setAlignment(Qt::AlignRight);lineEdit->setFont(font);lineEdit->setMinimumHeight(height);}//设置数字void Caculator::setNumber(int num){showTextEdit->setText(showTextEdit->text().trimmed() + QString::number(num));}//设置+、-、*、/、.、)等符号void Caculator::setOperation(int oper){if(!showTextEdit->text().isEmpty())int endIndex=showTextEdit->text().length()-1;QChar endChar=showTextEdit->text().at(endIndex);if(endChar!='+'&&endChar!='-'&&endChar!='*'&&endChar!='/'&&endChar!='.'&&e ndChar!='('&&endChar!='%'&&endChar!='^'){switch (oper){case 1:showTextEdit->setText(showTextEdit->text() + "+");break;case 2:showTextEdit->setText(showTextEdit->text() + "-");break;case 3:showTextEdit->setText(showTextEdit->text() + "*");break;case 4:showTextEdit->setText(showTextEdit->text() + "/");break;case 5:showTextEdit->setText(showTextEdit->text() + ".");break;case 6:showTextEdit->setText(showTextEdit->text() + ")");break;case 7:showTextEdit->setText(showTextEdit->text() + "^");break;case 8:showTextEdit->setText(showTextEdit->text() + "%");break;default:break;}}}}//计算x^2、x^3、sin、cos、tan等void Caculator::caculate(int cacu){double result;if(!showTextEdit->text().isEmpty())QString text=showTextEdit->text();int endIndex=text.length()-1;QChar endChar=text.at(endIndex);if(endChar!='+'&&endChar!='-'&&endChar!='*'&&endChar!='/'&&endChar!='.'&&endChar!='('&&endChar!=')'&&endChar!='%'&&endChar!='^'){double text_to_double=text.toDouble();switch (cacu) {case 1://开方if(text_to_double>=0){result=sqrt(text_to_double);showTextEdit->setText("sqrt("+QString::number(text_to_double)+")");}else{QMessageBox::warning(this,"警告","<b>被开方数不能为负！</b>");return;}break;case 2://平方result=pow(text_to_double,2.0);showTextEdit->setText("square("+QString::number(text_to_double)+")");break;case 3://立方result=pow(text_to_double,3.0);showTextEdit->setText("cube("+QString::number(text_to_double)+")");break;case 4://log10result=log10(text_to_double);showTextEdit->setText("log("+QString::number(text_to_double)+")");break;case 5://1/xresult=pow(text_to_double,-1.0);showTextEdit->setText("reciproc("+QString::number(text_to_double)+")");break;case 6://阶乘result=factorial((int)text_to_double);showTextEdit->setText("factorial("+QString::number(text_to_double)+")");break;case 7://sinresult=sin(text_to_double);showTextEdit->setText("sin("+QString::number(text_to_double)+")");break;case 8://cosresult=cos(text_to_double);showTextEdit->setText("cos("+QString::number(text_to_double)+")");break;case 9://tanresult=tan(text_to_double);showTextEdit->setText("tan("+QString::number(text_to_double)+")");break;case 10://Inresult=log(text_to_double);showTextEdit->setText("In("+QString::number(text_to_double)+")");break;case 11://10^xresult=pow(10,text_to_double);showTextEdit->setText("10^("+QString::number(text_to_double)+")");break;case 12://e^xresult=exp(text_to_double);showTextEdit->setText("e^("+QString::number(text_to_double)+")");break;case 13://sinhresult=sinh(text_to_double);showTextEdit->setText("sinh("+QString::number(text_to_double)+")");break;case 14://coshresult=cosh(text_to_double);showTextEdit->setText("cosh("+QString::number(text_to_double)+")");break;case 15://tanhresult=tanh(text_to_double);showTextEdit->setText("tanh("+QString::number(text_to_double)+")");break;default:break;}showResultEdit->clear();showResultEdit->setText(QString::number(result));}}}//计算阶乘long Caculator::factorial(int num){if(num<0){QMessageBox::warning(this,"警告","<b>阶乘数不能小于0！</b>");return -1;}long fac=1;for(int i=1;i<=num;i++){fac=fac*i;}return fac;}//关闭窗口事件void Caculator::closeEvent(QCloseEvent *event){QMessageBox msgBox;msgBox.setWindowTitle("提示");msgBox.setText("<b>您确定要退出吗？</b>");msgBox.setStandardButtons(QMessageBox::Ok | QMessageBox::Cancel);msgBox.setDefaultButton(QMessageBox::Ok);msgBox.setButtonText (QMessageBox::Ok,QString("确定"));msgBox.setButtonText (QMessageBox::Cancel,QString("取消"));int ret = msgBox.exec();switch (ret) {case QMessageBox::Ok:event->accept();break;case QMessageBox::Cancel:event->ignore();break;default:break;}}//按键事件void Caculator::keyPressEvent(QKeyEvent *key){switch (key->key()) {case Qt::Key_0:zeroBtnSlot();break;case Qt::Key_1:oneBtnSlot();break;case Qt::Key_2:twoBtnSlot();break;case Qt::Key_3:threeBtnSlot();break;case Qt::Key_4:fourBtnSlot();break;case Qt::Key_5:fiveBtnSlot();break;case Qt::Key_6:sixBtnSlot();break;case Qt::Key_7:sevenBtnSlot();break;case Qt::Key_8:eightBtnSlot();break;case Qt::Key_9:nineBtnSlot();break;case Qt::Key_Plus:addBtnSlot();break; // +case Qt::Key_Minus:subBtnSlot();break; // -case Qt::Key_Asterisk:mulBtnSlot();break; // *case Qt::Key_Slash:divideBtnSlot();break; // /c ase Qt::Key_Backspace:backBtnSlot();break; // ←case Qt::Key_Enter:equalBtnSlot();break; // =case Qt::Key_Period:pointBtnSlot();break; // .case Qt::Key_BraceLeft:left_bracketSlot();break; // (case Qt::Key_BraceRight:right_bracketSlot();break; // ) case Qt::Key_Percent:modBtnSlot();break; // %default:break;}}//清空内存void Caculator::clearMemoryBtnSlot(){sumMemory=0.0;}//读取内存void Caculator::readMemoryBtnSlot(){showTextEdit->setText(QString::number(sumMemory)); }//设置内存void Caculator::setMemoryBtnSlot(){equalBtnSlot();sumMemory = showTextEdit->text().toDouble(); }//正负号void Caculator::signBtnSlot(){QString temp=showTextEdit->text().trimmed();//判断是否位负数if(temp.startsWith("-")){temp = temp.mid(1);showTextEdit->setText(temp);return;}temp = temp.insert(0, "-");showTextEdit->setText(temp);}void Caculator::sqrtBtnSlot(){caculate(1);}void Caculator::sinBtnSlot(){caculate(7);}void Caculator::backBtnSlot(){if(!showTextEdit->text().trimmed().isEmpty()){QString text=showTextEdit->text();text.chop(1);showTextEdit->setText(text);}}void Caculator::ceBtnSlot(){showResultEdit->setText("0");}void Caculator::clearBtnSlot(){showTextEdit->clear();showResultEdit->setText("0"); }void Caculator::squBtnSlot(){caculate(2);}void Caculator::cosBtnSlot(){caculate(8);}void Caculator::sevenBtnSlot() {setNumber(7);}void Caculator::eightBtnSlot() {setNumber(8);}void Caculator::nineBtnSlot(){setNumber(9);}void Caculator::divideBtnSlot() {setOperation(4);}void Caculator::cubeBtnSlot(){caculate(3);}void Caculator::tanBtnSlot(){caculate(9);}void Caculator::fourBtnSlot(){setNumber(4);}void Caculator::fiveBtnSlot(){setNumber(5);}void Caculator::sixBtnSlot(){}void Caculator::mulBtnSlot(){setOperation(3);}void Caculator::logBtnSlot(){caculate(4);}void Caculator::InBtnSlot(){caculate(10);}void Caculator::oneBtnSlot(){setNumber(1);}void Caculator::twoBtnSlot(){setNumber(2);}void Caculator::threeBtnSlot() {setNumber(3);}void Caculator::subBtnSlot(){setOperation(2);}void Caculator::recipBtnSlot() {caculate(5);}void Caculator::tenxBtnSlot(){caculate(11);}void Caculator::zeroBtnSlot(){if(showTextEdit->text()=="0"){return;}}void Caculator::pointBtnSlot(){setOperation(5);}void Caculator::addBtnSlot(){setOperation(1);}void Caculator::factBtnSlot(){caculate(6);}void Caculator::equalBtnSlot(){std::string str=showTextEdit->text().toStdString();const char *S=str.c_str();char OPS[50];int len;double result;QString change;bool flag;toPostfix(S,OPS,len);evaluation(OPS,len,result,flag);change=QString::number(result,10,6);showResultEdit->setText(change);}void Caculator::left_bracketSlot(){showTextEdit->setText(showTextEdit->text().trimmed() + "("); }void Caculator::right_bracketSlot(){setOperation(6);}void Caculator::expBtnSlot(){caculate(12);}void Caculator::sinhBtnSlot(){caculate(13);}void Caculator::coshBtnSlot(){caculate(14);}void Caculator::tanhBtnSlot(){caculate(15);}void Caculator::xyBtnSlot(){setOperation(7);}void Caculator::modBtnSlot(){setOperation(8);}//中缀转换为后缀表达式，并且调整运算符优先级int Caculator::toPostfix(const char *S, char OPS[], int &len){QStack<char> OPE;int i,j=0;for (i = 0; i < strlen(S); i++){switch (S[i]){case'+':if(OPE.isEmpty())OPE.push(S[i]);else if (OPE.top() == '*' || OPE.top() == '/' ||OPE.top() == '%' ||OPE.top() == '^'){OPS[j++] = OPE.pop();i--;}elseOPE.push(S[i]);break;case'-':if('('!=S[i-1]&&0!=i){if(OPE.isEmpty())OPE.push(S[i]);else if (OPE.top() == '*' || OPE.top() == '/' ||OPE.top() == '%'||OPE.top() == '^'){OPS[j++] = OPE.pop();i--;}elseOPE.push(S[i]);}else{while ((S[i] >= '0'&&S[i] <= '9' )|| S[i] == '.'||('-'==S[i]&&(S[i-1]<'0'||S[i-1]>'9'))){OPS[j++] = S[i];if('-'==S[i])OPS[j++]='@';i++;}i--;OPS[j++] = '#'; //数字中的间隔符}break;case'*':case'/':case'^':case'%':OPE.push(S[i]);break;case'(':OPE.push(S[i]);break;case')':while (OPE.top() != '('){OPS[j++] = OPE.pop();}OPE.pop();break;default:while (S[i] >= '0'&&S[i] <= '9' || S[i] =='.'||('-'==S[i]&&S[i-1]<'0'&&S[i-1]>'9')){OPS[j++] = S[i];i++;}i--;OPS[j++] = '#'; //数字中的间隔符break;}}while (!OPE.isEmpty()){OPS[j++] = OPE.pop();}len = j;return 0;}//计算后缀表达式int Caculator::evaluation(char B[], int len, double &result, bool &flag) {int i;double a;double b;double c;QStack<double>SZ;for (i = 0; i < len; i++){switch (B[i]){case'+':{a = SZ.pop();b = SZ.pop();c = b + a;SZ.push(c);}break;case'-':{if('@'!=B[i+1]){a = SZ.pop();b = SZ.pop();c = b - a;SZ.push(c);}else{int jx = 0;double dx;char *stx = new char[10];while (B[i] != '#'){if('@'!=B[i])stx[jx++] = B[i];i++;}dx = atof(stx);SZ.push(dx);delete stx;}}break;case'*':{a = SZ.pop();b = SZ.pop();c = b*a;SZ.push(c);}break;case'^':{a = SZ.pop();b = SZ.pop();c = pow(b,a);SZ.push(c);}break;case'/':{a = SZ.pop();b = SZ.pop();if (a== 0){flag = false;return 0;}c = b / a;SZ.push(c);}break;case'%':{a = SZ.pop();b = SZ.pop();if (a== 0){flag = false;return 0;}c = (int)b % (int)a;SZ.push(c);}break;default:int j = 0;double d;char *st = new char[10];while (B[i] != '#'){st[j++] = B[i];i++;}d = atof(st);SZ.push(d);delete st;break;}}result=SZ.top();return 0;}main.cpp源文件#include "caculator.h"#include <QApplication>int main(int argc, char *argv[]){QApplication a(argc, argv);Caculator w;w.show();return a.exec();}程序运行截图1.加减乘除四则运算2.x^n3.平方根sqrt4.正弦函数sin5.余弦函数cos6.正切函数tan7.双曲正弦函数sinh8.双曲余弦函数cosh9.双曲正切函数tanh10.In(以e为底)11.log(以10为底)12.取模%。