C++第9次作业
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实验九: 多态性（一）1、定义计数器Counter类，对其重载运算符+ 。
实验代码：#include <iostream.h>class counter{private:int n;public:counter( ) { n=0;}counter(int i) {n=i;}counter operator+(counter c){counter temp;temp.n=n+c.n;return temp;}void disp( ){cout<<"n="<<n<<endl;}};void main(){counter c1(15),c2(10),c3;c3=c1+c2;c1.disp();c2.disp();c3.disp();}实验结果：2、定义一个基类BaseClass，从它派生出类DerivedClass，BaseClass有成员函数fn1()、fn2()，DerivedClass也有成员函数fn1()、fn2()，在主程序中定义一个DerivedClass的对象，分别用DerivedClass的对象以及BaseClass和DerivedClass的指针来调用fn1()、fn2()，观察运行结果。
实验代码：#include <iostream.h>class BaseClass{public:void fn1();void fn2();};void BaseClass::fn1(){cout << "调用基类的函数fn1()" << endl;}void BaseClass::fn2(){cout << "调用基类的函数fn2()" << endl;}class DerivedClass : public BaseClass{public:void fn1();void fn2();};void DerivedClass::fn1(){ cout << "调用派生类的函数fn1()" << endl; } void DerivedClass::fn2(){ cout << "调用派生类的函数fn2()" << endl; } void main(){DerivedClass aDerivedClass;DerivedClass *pDerivedClass = &aDerivedClass;BaseClass *pBaseClass = &aDerivedClass;aDerivedClass.fn1();aDerivedClass.fn2();pBaseClass->fn1();pBaseClass->fn2();pDerivedClass->fn1();pDerivedClass->fn2();}实验结果：3、实现重载函数Double(x)，返回值为输入参数的两倍；参数分别为整型、长整型、浮点型、双精度型，返回值类型与参数一样。
实验代码：#include<iostream>using namespace std;int Double(int a){return 2.0*a;}long int Double(long int a){return 2*a;}float Double(float a){return 2.0*a;}double Double(double a){return 2.00000*a;}void main(){int m;cout<<"输入一个整型数：";cin>>m;cout<<"它的两倍是"<<Double(m)<<endl;long int p;cout<<"输入一个长整型数：";cin>>p;cout<<"它的两倍是"<<Double(p)<<endl;float r;cout<<"输入一个浮点型数：";cin>>r;cout<<"它的两倍是"<<Double(r)<<endl;double n;cout<<"输入一个双精度数：";cin>>n;cout<<"它的两倍是"<<Double(n)<<endl;}实验结果：4、定义一个复数类，重载“+”；“-”；“*”，“/”运算符实现复数的四则运算。
实验代码：#include<iostream.h>class complex{private:double real;double imag;public:complex(){real=imag=0;}complex(double rpart,double ipart){real=rpart;imag=ipart;}complex operator+(const complex &com){complex temp;temp.real=real+com.real;temp.imag=imag+com.imag;return temp;}complex operator-(const complex &com){complex temp;temp.real=real-com.real;temp.imag=imag-com.imag;return temp;}complex operator*(const complex &com){complex temp;temp.real=real*com.real-imag*com.imag;temp.imag=real*com.imag+imag*com.real;return temp;}complex operator/(const complex &com){complex temp;temp.real=(real*com.real+imag*com.imag)/(com.real*com.real+com.imag*com.imag);temp.imag=(imag*com.real-real*com.imag)/(com.real*com.real+com.imag*com.imag);return temp;}void display(){if(imag>=0)cout<<"("<<real<<"+"<<imag<<"i)";elsecout<<"("<<real<<imag<<"i)";}};int main(void){double a,b,c,d;cout<<"输入两个复数，即a,b,c,d的值：";cin>>a>>b>>c>>d;complex n1(a,b),n2(c,d);cout<<"两个复数值为：";cout<<"A=";n1.display();cout<<" B=";n2.display();cout<<endl;cout<<endl<<endl<<"两个复数的加法："<<endl;complex result1;result1=n1+n2;n1.display();cout<<"+";n2.display();cout<<"=";result1.display();cout<<endl<<endl<<"两个复数的减法："<<endl;complex result2;result2=n1-n2;n1.display();cout<<"-";n2.display();cout<<"=";result2.display();cout<<endl<<endl<<"两个复数的乘法："<<endl;complex result3;result3=n1*n2;n1.display();cout<<"×";n2.display();cout<<"=";result3.display();cout<<endl<<endl<<"两个复数的除法："<<endl;if(c==0&&d==0)cout<<"不能进行运算，除数不能为0"<<endl;else{complex result4;result4=n1/n2;n1.display();cout<<"÷";n2.display();cout<<"=";result4.display();}cout<<endl;return 0;}实验结果：。
