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",https://www.360docs.net/doc/7f6303204.html,);

if(strcmp(https://www.360docs.net/doc/7f6303204.html,,"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(https://www.360docs.net/doc/7f6303204.html,,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",https://www.360docs.net/doc/7f6303204.html,,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",https://www.360docs.net/doc/7f6303204.html,,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(https://www.360docs.net/doc/7f6303204.html,,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",https://www.360docs.net/doc/7f6303204.html,,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",https://www.360docs.net/doc/7f6303204.html,,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*/

}

else

printf("\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。

void insert()

{

int i=0,j,k,lenth;

FILE *fp;

student s,xs[N];

system("cls");

printf("\n 请输入插入的学生的姓名:");scanf("%s",&https://www.360docs.net/doc/7f6303204.html,);

printf("\n 学生的学号:");scanf("%d",&s.num);

printf("\n 学生的性别:");scanf("%s",&s.sex);

printf("\n 高数成绩:");scanf("%f",&s.math);

printf("\n 英语成绩:");scanf("%f",&s.yingyu);

printf("\n 政治成绩:");scanf("%f",&s.zhengzhi);

printf("\n 语文成绩:");scanf("%f",&s.ywen);

s.aver=(s.math+s.yingyu+s.zhengzhi+s.ywen)/4;

s.sum= s.math+s.yingyu+s.zhengzhi+s.ywen;

printf("\n 插入位置:");scanf("%d",&k);

// i=0;

if((fp=fopen("student.dat","rb"))==NULL)

{

printf(" can't open file!\n");exit(0);

}

while(!feof(fp))

{

fread(&xs[i],sizeof(stu),1,fp);/*把数据读入到结构体数组中*/

if(feof(fp)) break;

i++;

fclose(fp);

lenth=i;

if(k=0)/*k的位置要位于数组范围之内*/

{//插入

for(j=lenth-1;j>=k;j--)

xs[j+1]=xs[j];/*一开始j是最大的，往后移一个这样移动避免数据被覆盖*/

/*循环是只循环这一句的*/

xs[k]=s;/*将输入的学生信息加入这个k位置*/

lenth++;/*长度+1*/

//写回

if((fp=fopen("student.dat","wb"))==NULL)

{

printf(" 不能建立文件!!\n");exit(0);

}

for(i=0;i

fwrite(&xs[i],sizeof(stu),1,fp);

}

else/*不再数组范围之内*/

{

if((fp=fopen("student.dat","ab"))==NULL)

{

printf(" 不能建立文件!!\n");exit(0);

}

fwrite(&s,sizeof(stu),1,fp);

}

printf("\n 按任意键返回主菜单");

fclose(fp);

}

//显示

void print()

{

FILE *fp;

student s;

system("cls");

if((fp=fopen("student.dat","rb"))==NULL)

{

printf(" can't open file!\n");exit(0);

}

printf(" 学生成绩表");

printf("\n *****************************************************");

printf("\n %10s %10s%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");

while(!feof(fp))

fread(&s,sizeof(stu),1,fp);//从文件中读取成绩信息

if(feof(fp)) break;//判断是否文件尾

printf("\n %10s %6d %6s %6.2f %6.2f %6.2f %6.2f %6.2f %6.2f\n",https://www.360docs.net/doc/7f6303204.html,,s.num ,s.sex,s.math,s.yingyu,s.zhengzhi,s.ywen,s.aver,s.sum);

}

fclose(fp);

printf("\n 按任意键返回主菜单");

getch();

}

//统计

void tongji()

{

int i=0,j=0,k=0,l=0,m=0,n,p,q,r,t,u;

FILE *fp;

student s[N], *p1[N],*p2[N],*p3[N],*p4[N];/*用指针数组*/

system("cls");

if((fp=fopen("student.dat","rb"))==NULL) {printf("cant't open file!\n");exit(0);}

while(!feof(fp))

{

fread(&s[i++],sizeof(stu),1,fp);/*读入数据*/

if(feof(fp)) break;

}

t=i;i=0;

for(u=0;u

{

if(s[i].aver<60) {p1[j++]=&s[i++];continue;}/*每个学生信息只能位于一个分数段*/

if(s[i].aver>=60&&s[i].aver<80) {p2[k++]=&s[i++];continue;}

if(s[i].aver>=80&&s[i].aver<90) {p3[l++]=&s[i++];continue;}

if(s[i].aver>=90) {p4[m++]=&s[i++];continue;}

}

printf(" 学生成绩单");

printf("\n 90以上的人有：姓名学号平均分\n");

for(r=0;r

{

printf("\n %10s %6d %6.2f\n",p4[r]->name,p4[r]->num,p4[r]->aver);

}

printf("\n 80-89分的人有：姓名学号平均分\n");

for(q=0;q

{

printf("\n %10s %6d %6.2f\n",p3[q]->name,p3[q]->num,p3[q]->aver);

}

printf("\n 60-79分的人有：姓名学号平均分\n");

for(p=0;p

{

printf("\n %10s %6d %6.2f\n",p2[p]->name,p2[p]->num,p2[p]->aver); }

printf("\n 不及格的人有：姓名学号平均分\n");

for(n=0;n

{

printf("\n %10s %6d %6.2f\n",p1[n]->name,p1[n]->num,p1[n]->aver); }

fclose(fp);

printf("\n 按任意键返回主菜单");

getch();

}

// if(s[i].aver<60) {p1[j++]=&s[i++];continue;}/*每个学生信息只能位于一个分数段*/ if(s[i].aver>=60&&s[i].aver<80) {p2[k++]=&s[i++];continue;}

if(s[i].aver>=80&&s[i].aver<90) {p3[l++]=&s[i++];continue;}

if(s[i].aver>=90) {p4[m++]=&s[i++];continue;}

}

printf(" 学生成绩单");

printf("\n 90以上的人有：姓名学号平均分\n");

for(r=0;r

{

printf("\n %10s %6d %6.2f\n",p4[r]->name,p4[r]->num,p4[r]->aver); }

printf("\n 80-89分的人有：姓名学号平均分\n");

for(q=0;q

{

printf("\n %10s %6d %6.2f\n",p3[q]->name,p3[q]->num,p3[q]->aver); }

printf("\n 60-79分的人有：姓名学号平均分\n");

for(p=0;p

{

printf("\n %10s %6d %6.2f\n",p2[p]->name,p2[p]->num,p2[p]->aver); }

printf("\n 不及格的人有：姓名学号平均分\n");

for(n=0;n

{

printf("\n %10s %6d %6.2f\n",p1[n]->name,p1[n]->num,p1[n]->aver); }

fclose(fp);

printf("\n 按任意键返回主菜单");

getch();

}

//删除:输入学生姓名，若该学生存在，则删除，并显示删除后余下的学生成绩信息void dele()

{

student xs[N];

FILE *fp;

char name[10];

int i=0,len,k=-1/*k<0是为后面if判断用的*/;

system("cls");

printf("\n 输入要删除的学生姓名: ");scanf("%s",name);

if((fp=fopen("student.dat","rb+"))==NULL)

{printf(" can't open file!\n");exit(0);}

while(!feof(fp))

{

删除:输入学生姓名，若该学生存在，则删除，并显示删除后余下的学生成绩信息void dele()

{

student xs[N];

FILE *fp;

char name[10];

int i=0,len,k=-1/*k<0是为后面if判断用的*/;

system("cls");

printf("\n 输入要删除的学生姓名: ");scanf("%s",name);

if((fp=fopen("student.dat","rb+"))==NULL)

{printf(" can't open file!\n");exit(0);}

while(!feof(fp))

{

fread(&xs[i],sizeof(stu),1,fp);

if(feof(fp)) break;

if(strcmp(xs[i].name,name)==0) k=i;

i++;

}

fclose(fp);

//以下是删除后重新写文件

len=i;/*结构体数组上限*/

if(k>=0)/*k>0说明找到删除学生位置*/

{

if((fp=fopen("student.dat","wb+"))==NULL)

{printf(" can't open file!\n");exit(0);}

for(i=0;i

if(i==k) continue;/*从这个位置开始写入*/

fwrite(&xs[i],sizeof(stu),1,fp);

}

fclose(fp);

}

else {printf("\n 删除失败!!!\n");getch();} /*失败后重新返回菜单*/ printf("\n 按任意键返回主菜单");

print();

}

//菜单选择

void main()

{

char ch;

system("color 3f");

while(1)

{

menu();// 显示菜单

ch=getch();//选择菜单

if(ch=='0') break;

switch(ch)//判断功能项

{

case'1':input();break;

case '2':search();break;

case '3':modi();break;

case '4':insert();break;

case '5':print( );break;

case '6':tongji();break;

case '7':dele();break;

}

}

}