c语言大作业非常经典

#include "stdafx.h"

#include

#include

#include

#include

#define N 100

struct 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");