c语言大作业非常经典

#include "stdafx.h"#include <stdio.h>#include <stdlib.h>#include <conio.h>#include <string.h>#define N 100struct student{char name[10];int num;char sex[10];float math;float yingyu;float zhengzhi;float ywen;float aver;float sum;}stu;//菜单void menu() /*便于操作员使用*/{ /*清屏*/system("cls");printf(" * 欢迎使用学生成绩管理系统* \n");printf(" * ======================= * \n");printf(" * 请选择相应的功能: * \n");printf(" * 1.成绩录入* \n");printf(" * 2.查询成绩* \n");printf(" * 3.修改成绩* \n");printf(" * 4.插入成绩* \n");printf(" * 5.报表输出* \n");printf(" * 6.统计输出* \n");printf(" * 7.删除操作* \n");printf(" * 0.退出系统* \n" );printf(" * ======================= * \n");printf(" \n\n\n\n\n\n\n\n\n * * 机101-S1 林凯(201023701102) 制作* * \n");}//成绩录入void input(){system("cls");FILE *fp;student xs; /*定义一个结构体变量来装从文件中读出来的数据*/int c=1;if((fp=fopen("student.dat","ab"))==NULL){printf("can't open file!\n");exit(0);}printf("\n 成绩录入");printf("\n****************************************************");while(c++) /*中间加油break，可使循环中断*/{printf("\n 请输入您的姓名(姓名为end结束)：");scanf("%s",);if(strcmp(,"end")==0) break;/*判断姓名是否为end，用字符串判断*/printf("\n 请输入学号：");scanf("%d",&xs.num);printf("\n 性别：");scanf("%s",&xs.sex);printf("\n 请输入高数的成绩：");scanf("%f",&xs.math);printf("\n 请输入英语的成绩：");scanf("%f",&xs.yingyu);printf("\n 请输入政治的成绩：");scanf("%f",&xs.zhengzhi);printf("\n 请输入语文的成绩：");scanf("%f",&xs.ywen);xs.aver=0;/*给平均分变量赋初值*/xs.aver=(xs.math+xs.yingyu+xs.zhengzhi+xs.ywen)/4;xs.sum=0;xs.sum=xs.math+xs.yingyu+xs.zhengzhi+xs.ywen;fwrite(&xs,sizeof(stu),1,fp); //将成绩信息写入文件system("cls");}fclose(fp);}void xingming(){FILE *fp;student xs;char name[10];printf("\n 输入要查学生的姓名: ");scanf("%s",name);if((fp=fopen("student.dat","rb"))==NULL){printf("can't open file!\n");exit(0);}while(!feof(fp)){fread(&xs,sizeof(stu),1,fp);if(strcmp(,name)==0)/*按姓名查询时判断输入的姓名是否存在，会循环从数据中找取*/{printf("\n 学生的信息如下:\n");printf("\n %10s %6s %6s %6s %6s %6s %6s %6s %6s\n","姓名","学号","性别","高数","英语","政治","语文","平均成绩","总成绩");printf("\n %10s %6d%6s %6.2f %6.2f %6.2f %6.2f %6.2f %6.2f\n",,xs.num,xs.sex, xs.math,xs.yingyu,xs.zhengzhi,xs.ywen,xs.aver,xs.sum);break;}}if(feof(fp))printf("\n 查找失败!!!"); /*学生不存在*/fclose(fp);}void xuehao(){FILE *fp;student xs;int num;printf("\n 输入要查学生的学号: ");scanf("%d",&num);if((fp=fopen("student.dat","rb"))==NULL){printf("can't open file!\n");exit(0);}while(!feof(fp)){fread(&xs,sizeof(stu),1,fp);if(xs.num==num)/*按学号查询时判断输入的学号是否存在，会循环从数据中找取*/{printf("\n 学生的信息如下:\n");printf("\n %10s %6s %6s %6s %6s %6s %6s %6s %6s\n","姓名","学号","性别","高数","英语","政治","语文","平均成绩","总成绩");printf("\n %10s %6d%6s %6.2f %6.2f %6.2f %6.2f %6.2f %6.2f\n",,xs.num,xs.sex,xs .math,xs.yingyu,xs.zhengzhi,xs.ywen,xs.aver,xs.sum);break;}}if(feof(fp)) printf("\n 查找失败!!!");fclose(fp);}//查询void search(){char ch1;system("cls");printf(" 请输入按何种方式查询：\n");printf("\n 1-姓名，2-学号:");ch1=getchar();/*用字符接收*/switch(ch1)/*判断*/{case '1':xingming();break;case '2':xuehao();break;}printf("\n 按任意键返回主菜单");getch();/*让屏幕停留同时按任意键返回*/}//修改:输入学生的姓名,查找该学生，若找到则修改该生的成绩信息，并显示修改前后的结果；void modi(){student xs;FILE *fp;char name[10];system("cls");printf("\n 输入要修改的学生的姓名: ");scanf("%s",name);if((fp=fopen("student.dat","rb+"))==NULL){printf("can't open file!\n");exit(0);}while(!feof(fp)){fread(&xs,sizeof(stu),1,fp);if(strcmp(,name)==0)/*判断输入要修改的姓名是否存在*/{printf(" 修改前学生的信息如下:\n");printf("\n %10s %6s %6s %6s %6s %6s %6s %6s %6s\n","姓名","学号","性别","高数","英语","政治","语文","平均成绩","总成绩");printf("\n %10s %6d %6s %6.2f %6.2f %6.2f %6.2f %6.2f\n",,xs.num,xs.sex,xs.math,xs.y ingyu,xs.zhengzhi,xs.ywen,xs.aver,xs.sum);printf("\n 请输入该生的高数成绩:");scanf("%f",&xs.math);printf("\n 英语成绩:");scanf("%f",&xs.yingyu);printf("\n 政治成绩:");scanf("%f",&xs.zhengzhi);printf("\n 语文成绩:");scanf("%f",&xs.ywen);xs.aver=(xs.math +xs.yingyu +xs.zhengzhi +xs.ywen)/4;xs.sum=xs.math +xs.yingyu +xs.zhengzhi +xs.ywen;break;}}if(!feof(fp)){printf(" \n 修改后的学生的信息如下:\n");printf("\n %10s %6s %6s %6s %6s %6s %6s %6s %6s\n","姓名","学号","性别","高数","英语","政治","语文","平均成绩","总成绩");printf("\n %10s %6d %6s %6.2f %6.2f %6.2f %6.2f %6.2f\n",,xs.num,xs.sex,xs.math,xs.y ingyu,xs.zhengzhi,xs.ywen,xs.aver,xs.sum);fseek(fp,sizeof(stu),1);/*负号表示后退，1表示文件当前位置*/fwrite(&xs,sizeof(stu),1,fp);/*再写入，同时把要修改的那个覆盖掉*/}elseprintf("\n 学生不存在，修改失败!!");fclose(fp);printf("\n 按任意键返回主菜单");getch();}//插入:输入学生的平时的各项成绩，插入到指定位置；当指定的位置超出范围时，将其插入到全班的最后，并显示插入成功后的结果。