#include "stdafx.h"#include "stdio.h"#include "stdlib.h"#include "string.h"#include "malloc.h"#define LEN sizeof(struct student) #define NULL 0int n,m;int k=1;struct student{char num[20];char name[20];int age;char profession[50];int maths;int english;int C_program;float ave;struct student * next;};float ave(struct student * p1){float ave;ave=(float)(p1->maths+p1->english+p1->C_program)/3;return ave;}void save(struct student *head){struct student *p1 = head;FILE *outFile;outFile = fopen("stu.bin", "wb");if (outFile == NULL) {printf("\nFile error.");}else {while(p1 != NULL){fwrite(p1, sizeof(struct student), 1, outFile);p1 = p1->next;}fclose(outFile);}}//将数据存入文档中void check(struct student * head,struct student * p1) {struct student *h=head;for(m=0;m<n;m++,h=h->next ){if(strcmp( h->num,p1->num)==0){printf("输入号码重复\n");printf("请重新输入学号：");scanf("%s",p1->num);getchar();check(head,p1);}}}//检验学号是否重复struct student * creat(){struct student * head;struct student *p1,*p2;n=0;p1=p2=(struct student *)malloc(LEN); printf("学号:\n");scanf("%s",p1->num);getchar();printf("姓名:\n");gets(p1->name);printf("年龄:\n");scanf("%d",&p1->age);getchar();printf("专业:\n");gets(p1->profession);printf("数学成绩:\n");scanf("%d",&p1->maths);printf("英语成绩:\n");scanf("%d",&p1->english);printf("C语言成绩:\n");scanf("%d",&p1->C_program);head=NULL;while(strcmp(p1->num,"0")!=0){n=n+1;if(n==1)head=p1;else p2->next=p1;p2=p1;p1=(struct student *)malloc(LEN);printf("学号:\n");scanf("%s",p1->num);getchar();check(head,p1);//检查输入的学号是不是重复且是不是重复输错 printf("姓名:\n");gets(p1->name);printf("年龄:\n");scanf("%d",&p1->age);getchar();printf("专业:\n");gets(p1->profession);printf("数学成绩:\n");scanf("%d",&p1->maths);printf("英语成绩:\n");scanf("%d",&p1->english);printf("C语言成绩:\n");scanf("%d",&p1->C_program);}p2->next=NULL;save(head);return(head);}//录入数据并将其保存至文档void print(struct student *head){struct student * p;printf("\n这%d个学生的成绩为:\n",n);printf("学号姓名年龄专业数学英语 C语言平均成绩\n");p=head;if(head==NULL)printf("The info error\n");if(head!=NULL)while(p!=NULL){p->ave=ave(p);printf("%s%8s%8d%13s%9d%10d%9d%10.2f",p->num,p->name,p->age,p->profession,p->maths,p->engl ish,p->C_program,p->ave);printf("\n");p=p->next;}}//输出链表//struct student* read(){struct student *head = NULL;struct student *p2 = head;struct student record;FILE *infile;infile = fopen("stu.bin", "rb");n=1;if(infile == NULL){printf("\nFile error.");}else {head = (struct student *)malloc(sizeof(struct student));fread(head, sizeof(*head), 1, infile);p2 = head;while(fread(&record, sizeof(record), 1, infile))//fread返回数据个数，结束和出错返回0；{p2->next = (struct student *)malloc(sizeof(struct student));memcpy(p2->next, &record, sizeof(record)); //复制结构体数据p2 = p2->next;n=n+1;}p2->next=NULL;fclose(infile);}return head;}//从文件中读取数据struct student * search_num(struct student * head,char array[20]){struct student * p1;p1=head;if(head==NULL){printf("打开错误");return(head);}while((strcmp(array,p1->num)!=0)&&(p1->next!=NULL)){p1=p1->next;}//找到相应的学号if(strcmp(array,p1->num)==0){printf("学号姓名年龄专业数学英语 C语言\n");printf("%s%10s%10d%15s%11d%12d%11d",p1->num,p1->name,p1->age,p1->profession,p1->maths,p1-> english,p1->C_program);printf("\n");}else printf("此学号不存在\n");return(head);}//按学号查询数据//]struct student * search_name(struct student * head,char array[20]){struct student * p1;p1=head;if(head==NULL){printf("打开错误");return(head);}while((strcmp(array,p1->name)!=0)&&(p1->next!=NULL)){p1=p1->next;}//找到相应的学号if(strcmp(array,p1->name)==0){printf("学号姓名年龄专业数学英语 C语言\n");printf("%s%10s%10d%15s%11d%12d%11d",p1->num,p1->name,p1->age,p1->profession,p1->maths,p1-> english,p1->C_program);printf("\n");}else printf("此姓名不存在\n");return(head);}//按姓名查询数据//struct student * change(struct student * head,char array[20]){struct student *p1;p1=head;if(head==NULL){printf("打开错误！");return(head);}while((strcmp(array,p1->num)!=0)&&(p1->next!=NULL)) {p1=p1->next;} //找到相应的学号if(strcmp(array,p1->num)==0){printf("请输入更改的学号:\n");printf("学号:\n");scanf("%s",p1->num);getchar();printf("姓名:\n");gets(p1->name);printf("年龄:\n");scanf("%d",&p1->age);getchar();printf("专业:\n");gets(p1->profession);printf("数学成绩:\n");scanf("%d",&p1->maths);printf("英语成绩:\n");scanf("%d",&p1->english);printf("C语言成绩:\n");scanf("%d",&p1->C_program);save(head);}else printf("所查学号不存在\n");return(head);}//修改数据//struct student * del(struct student * head,char array[20]) {struct student * p1,* p2;if(head==NULL){printf("\nlist null!\n");return head;}p1=head;while((strcmp(array,p1->num)!=0)&&(p1->next!=NULL)){p2=p1;p1=p1->next;}//找到相应的学号、if((strcmp(array,p1->num)==0)){if(strcmp(array,head->num)==0)head=p1->next;elsep2->next=p1->next;}elseprintf("你查询的学号（%s）不存在！",p1->num);save(head);return(head);}void add(struct student * head){struct student *p1;printf("\n请输入添加学生的信息:\n");p1=(struct student *)malloc(LEN);printf("学号:\n");scanf("%s",p1->num);getchar();check(head,p1);printf("姓名:\n");gets(p1->name);printf("年龄:\n");scanf("%d",&p1->age);getchar();printf("专业:\n");gets(p1->profession);printf("数学成绩:\n");scanf("%d",&p1->maths);printf("英语成绩:\n");scanf("%d",&p1->english);printf("C语言成绩:\n");scanf("%d",&p1->C_program);FILE *outFile;outFile = fopen("stu.bin", "ab");if (outFile == NULL) {printf("\n打开错误.");}fwrite(p1, sizeof(struct student), 1, outFile);fclose(outFile);}void sta(struct student * head,char array[20],int max,int min) {struct student *p1=head;int k=0;if(strcmp(array,"maths")==0){while(p1!=NULL){if(p1->maths>=min&&p1->maths<=max)k++;p1=p1->next;}printf("数学科目在%d到%d之间的人数为：%d\n",min,max,k);}else if(strcmp(array,"english")==0){while(p1!=NULL){if(p1->english>=min&&p1->english<=max)k++;p1=p1->next;}printf("英语科目在%d到%d之间的人数为：%d\n",min,max,k); }else if(strcmp(array,"C_program")==0){while(p1!=NULL)if(p1->C_program>=min&&p1->C_program<=max)k++;p1=p1->next;}printf("C语言科目在%d到%d之间的人数为：%d\n",min,max,k); }}void exit(){printf("\t\t");printf("**********************\n");printf("\t\t");printf("*******感谢使用*******\n");printf("\t\t");printf("**********************\n");k=0;}void Chooseproject(int i){ struct student * head=NULL;if(i==1){head = read();print(head);else if(i==2){int p=1 ;printf("请选择按学号查询（1）还是按姓名查询（0）:");scanf("%d",&p);while(p!=1&&p!=0){printf("输入错误!");printf("请选择学号查询（1）还是姓名查询（0）");scanf("%d",&p);}if(p==1){head = read();char num[20];printf("请输入查询的学号:\n");scanf("%s",num);head=search_num(head,num);while(strcmp(num,"0")!=0){printf("是否继续查询（是就输学号，否就输0）:\n");scanf("%s",num);if(strcmp(num,"0")==0)break;head=search_num(head,num);}}else if(p==0){head = read();char name[20];printf("请输入查询的学号:\n");scanf("%s",name);head=search_name(head,name);while(strcmp(name,"0")!=0){printf("是否继续查询（是就输学号，否就输0）:\n"); scanf("%s",name);if(strcmp(name,"0")==0)break;head=search_name(head,name);}}}else if(i==3){ head = read();char num[20];printf("请输入要更改的学号:\n");scanf("%s",num);getchar();head=change(head,num);print(head);while(strcmp(num,"0")!=0){printf("是否继续更改（是就输学号，否就输0）:\n"); scanf("%s",num);getchar();if(strcmp(num,"0")==0)break;head=change(head,num);print(head);}}else if(i==4){head=read();add(head);}else if(i==5){char num[20];head=read();printf("请输入要删除的学号:\n");scanf("%s",num);getchar();head=del(head,num);print(head);}else if(i==6){head = read();int i;printf("\t\t");printf("************1.学号排序;********************\n");printf("\t\t");printf("************2.平均成绩排序;****************\n");printf("\t\t");printf("************3.数学成绩排序;****************\n"); printf("\t\t");printf("************4.英语成绩排序;****************\n"); printf("\t\t");printf("************5.C语言成绩排序;***************\n");printf("请输入相应的排序代号:");scanf("%d",&i);sort_down(head,i);}else if(i==7){head=read();int min,max;char subject[20];printf("\t\t");printf("************数学(maths);***************\n");printf("\t\t");printf("************英语(english);*************\n");printf("\t\t");printf("***********C语言(C_program);***********\n");printf("请选择要统计的项目:\n");scanf("%s",subject);getchar();while((strcmp(subject,"maths")!=0&&strcmp(subject,"english")!=0&&strcmp(subject,"C_pro gram")!=0)){printf("输入错误！");printf("\t\t");printf("************数学(maths);***********\n");printf("\t\t");printf("************英语(english);***********\n");printf("\t\t");printf("***********C语言(C_program);***********\n");printf("请选择要统计的项目:\n");scanf("%s",subject);getchar();}printf("请输入分数段的区间：");printf("区间上限：");scanf("%d",&max);printf("区间下限：");scanf("%d",&min);while(min>=max){printf("输入的下限大于等于上限，错误！");printf("请重新输入分数段的区间：");printf("区间上限：");scanf("%d",max);printf("区间下限：");scanf("%d",min);}sta(head,subject,max,min);}else if(i==8){printf("\t\t");printf("************************************\n");printf("\t\t");printf("**************感谢使用**************\n");printf("\t\t");printf("************************************\n");k=0;}}//选择功能void menu(){int i;printf("\t\t");printf("***********1.信息浏览;***********\n");printf("\t\t");printf("***********2.信息查询;***********\n");printf("\t\t");printf("***********3.信息修改;***********\n");printf("\t\t");printf("***********4.信息添加;***********\n");printf("\t\t");printf("***********5.信息删除;***********\n");printf("\t\t");printf("***********6.信息排序;***********\n");printf("\t\t");printf("***********7.信息统计;***********\n");printf("\t\t");printf("***********8,退出系统;***********\n");printf("请选择项目：");scanf("%d",&i);while(i<1||i>8){printf("输入错误，请重新输入：\n");printf("\t\t");printf("***********1.信息浏览;***********\n");printf("\t\t");printf("***********2.信息查询;***********\n");printf("\t\t");printf("***********3.信息修改;***********\n");printf("\t\t");printf("***********4.信息添加;***********\n");printf("\t\t");printf("***********5.信息删除;***********\n");printf("\t\t");printf("***********6.信息统计;***********\n");printf("\t\t");printf("***********7,退出系统;***********\n");printf("请重新选择项目：");scanf("%d",&i);}Chooseproject(i);}int _tmain(int argc, _TCHAR* argv[]){ struct student *head = NULL;printf("\t\t");printf("************************************************************\n");printf("\t\t");printf("*********************学生管理系***************************\n");printf("\t\t");printf("************************************************************\n" );printf("是否已经录入信息？\n");char c;printf("请输入 'y' 或 'n':");c=getchar();getchar();while(c!='n'&&c!='y'){printf("输入错误，请重新输入( 'y' 或 'n')：\n");c=getchar();getchar();}if(c=='n'){printf("请输入学生成绩:\n");head=creat();}while(k!=0){menu();}system("pause");return 0;}。
