学生成绩管理系统-vs汇编

学习 -----好资料
#include <stdio.h>
#include <stdlib.h>
#include<conio.h>
#include <dos.h>
#include<string.h>
#define LEN sizeof ( struct student)
#define FORMAT "%-8d%-15s%-12.1lf%-12.1lf%-12.1lf%-12.1lf\n"
#define DATA stu[i].num,stu[i].name,stu[i].elec,stu[i].expe,stu[i].requ,stu[i].sum float Ielec,Iexpe,Irequ;
float Felec,Fexpe,Frequ;
struct student /* 定义学生成绩结构体*/
{
int num; /* 学号 */
char name[15]; /* 姓名 */
double elec; /* 选修课 */
double expe; /* 实验课 */
double requ; /* 必修课 */
double sum; /* 总分 */
};
struct student stu[50];/* 定义结构体数组*/
void input();/* 录入学生成绩信息*/
void show(); /* 显示学生信息*/
void sort();/* 按总分排序 */
void del(); /* 删除学生成绩信息*/
void modify();/* 修改学生成绩信息*/
void menu(); /* 主菜单 */
void insert();/* 插入学生信息*/
void total();/* 计算总人数*/
void search(); /* 查找学生信息*/
main()
{
int n;
menu();
scanf( "%d" ,&n);
while (n)
{
switch (n)
{
case 1: input();break ;
case 2: search();break ;
case 3: del();break ;
case 4: modify();break ;
case 5: insert();break ;
case 6: sort();break ;
case 7: total();break ;
default : break ;
}
menu();
scanf( "%d" ,&n);
}
}
void show()
{
FILE *fp;
int i,m=0;
fp=fopen( "d:\\data.txt", "ab+" );
while (!feof(fp))
{
if (fread(&stu[m] ,LEN,1,fp)==1)
m++;
}
fclose(fp);
printf( "number name elective experiment required sum\t\n" ); for (i=0;i<m;i++)
{
printf(FORMAT,DATA); /* 将信息按指定格式打印*/
}
}
void menu()
{
system("cls");
printf("\n");
printf("\n");
printf("\t|--------------------Student management system--------------------|\n");
printf("\t||\n");
printf("\t|0. exit|\n");
printf("\t||\n");
printf("\t| 1. input record|\n");
printf("\t||\n");
printf("\t| 2. search record|\n");
printf("\t||\n");
printf("\t| 3. delete record|\n");
printf("\t||\n");
printf("\t| 4. modify record|\n");
printf("\t||\n");
printf("\t| 5. insert record|\n");
printf("\t||\n");
printf("\t| 6. order|\n");
printf("\t||\n");
printf("\t|7. number|\n");
printf("\t||\n");
printf("\t|-----------------------------------------------------------------|\n");
printf("\n");
printf("\n");
printf("choose( 0 ~ 7 ):");
}
void input()
{
int i,m=0;
char ch[2];
FILE *fp;
if((fp=fopen("d:\\data.txt", "ab+" ))==NULL)/* 打开指定文件 */
{
printf("can not open\n");
return ;/* 返回主函数 */
}
while (!feof(fp))/*feof()函数是用来判断指针是否已经到达文件尾部的，
若指针指向文件末尾，则返回值为“真”，返回。

*/ {
if(fread(&stu[m],LEN,1,fp)==1)
m++; /* 统计当前记录条数*/
}
fclose(fp);
if(m==0)
printf("No record!\n");
else
{
system("cls");
show();/* 调用 show函数，显示原有信息 */
}
if((fp=fopen("d:\\data.txt", "wb" ))==NULL)
{
printf("can not open\n");
return;
}
for (i=0;i<m;i++)
fwrite(&stu[m],LEN,1,fp);/* 向指定磁盘文件写入信息*/
printf("please input (y/n):/n");
scanf("%s" ,&ch);
if(strcmp(ch,"y")==0||strcmp(ch,"Y" )==0)
{
printf("please input per centum:");
printf("\nelective:");
scanf("%f" ,&Ielec);
printf("/nexperiment:");
scanf("%f" ,&Iexpe);
printf("/nrequired course:");
scanf("%f" ,&Irequ);
}
while (strcmp(ch,"y")==0||strcmp(ch,"Y" )==0)
{
printf("number:");
scanf("%d" ,&stu[m].num);/* 输入学生学号 */
for (i=0;i<m;i++)
if(stu[i].num==stu[m].num)
{
printf("the number is existing,press any to continue!");
getch();
fclose(fp);
return ;
}
printf( "name:" );
scanf( "%s" ,&stu[m].name);/* 输入学生姓名*/
printf( "elective:");
scanf( "%lf" ,&stu[m].elec);/* 输入选修课成绩*/
printf( "experiment:");
scanf("%lf" ,&stu[m].expe);/* 输入实验课成绩*/
printf( "required course:");
scanf( "%lf" ,&stu[m].requ);/* 输入必修课成绩*/
stu[m].sum=stu[m].elec*Ielec+stu[m].expe*Iexpe+stu[m].requ*Irequ;/* 计算出总成绩 */
if (fwrite(&stu[m],LEN,1,fp)!=1)/* 将新录入的信息写入指定的磁盘文件*/
{
printf( "can not save!");
getch();
}
else
{
printf( "%s saved!\n",stu[m].name);
m++;
}
printf( "continue?(y/n):"); /* 询问是否继续*/
scanf( "%s" ,ch);
}
fclose(fp);
printf( "OK!\n" );
}
void search()/* 自定义查找函数*/
{
FILE *fp;
int snum,i,m=0;
char ch[2];
if ((fp=fopen( "d:\\data.txt", "ab+" ))==NULL)
{
printf( "can not open\n");
return ;
}
while (!feof(fp))
if (fread(&stu[m],LEN,1,fp)==1)
m++;
if (m==0)
{
printf( "no record!\n");
return ;
}
printf( "please input the number:");
scanf( "%d" ,&snum);/* 输入需要查找学生的学号*/
for (i=0;i<m;i++)
if (snum==stu[i].num)/** 查找出入的学号是否在记录中*/
{
printf( "find the student,show?(y/n)");
scanf( "%s" ,ch);
if (strcmp(ch, "y" )==0||strcmp(ch,"Y" )==0)
{
printf( "number name e lective experiment required
sum\t\n" );
printf(FORMAT,DATA);/* 将查找出得结果按指定格式输出*/
break ;
}
}
if (i==m)
printf( "can not find the student!\n");/* 没有找到要查额信息*/
system( "pause" );
}
void modify()/* 自定义修改函数*/
{
int i,j,snum,m=0;
FILE *fp;
if ((fp=fopen( "d:\\data.txt", "ab+" ))==NULL)
{
printf("can not open\n");
return;
}
while (!feof(fp))
if(fread(&stu[m],LEN,1,fp)==1)
m++;
if(m==0)
{
printf("no record!\n");
fclose(fp);
return;
}
printf("please input the number of the student which do you want to modify!\n");
scanf("%d" ,&snum);
for (i=0;i<m;i++)
if(snum==stu[i].num)/* 检索记录中是否有要修改的信息*/
break ;
if(i<m)
{
printf("find the student! you can modify now!\n");
printf("please input per centnm:");
printf("\nelective:");
scanf("%f" ,&Ielec);
printf("\nexperiment:");
scanf( "%f" ,&Iexpe);
printf( "\nrequired course:");
scanf( "%f" ,&Irequ);
printf( "name:\n" );
scanf("%s" ,&stu[i].name);
printf( "\nelective:");
scanf("%lf" ,&stu[i].elec);
printf( "\nexperiment:");
scanf("%lf" ,&stu[i].expe);
printf("\nrequired course:");
scanf("%lf" ,&stu[i].requ);
stu[i].sum=stu[i].elec*Ielec+stu[i].expe*Iexpe+stu[i].requ*Irequ;
}
else
{
printf( "can not find!");
getch();
return ;
}
if ((fp=fopen( "d:\\data.txt", "wb" ))==NULL)
{
printf( "can not open\n");
return ;
}
for (j=0;j<m;j++)
if (fwrite(&stu[j],LEN,1,fp)!=1)
{
printf( "can not save!");
getch();
}
fclose(fp);
}
void del()/* 自定义删除函数*/
{
int snum,i,j,m=0;
char ch[2];
FILE *fp;
if ((fp=fopen( "d:\\data.txt", "ab+" ))==NULL)
{
printf( "can not open\n");
return ;
}
while (!feof(fp))
if (fread(&stu[m],LEN,1,fp)==1)
m++;
fclose(fp);
if (m==0)
{
printf( "no record!\n");
return ;
}
printf( "please input the number:");
scanf( "%d" ,&snum);
for (i=0;i<m;i++)
if (snum=stu[i].num)
break ;
printf( "find the student,delete?(y/n)");
scanf( "%s" ,ch);
if (strcmp(ch, "y" )==0||strcmp(ch,"Y" )==0)
for (j=i;j<m;j++)
stu[j]=stu[j+1];
m--;
if ((fp=fopen( "d:\\data.txt", "wb" ))==NULL)
{
printf( "can not open\n");
return ;
}
for (j=0;j<m;j++)
if (fwrite(&stu[j],LEN,1,fp)!=1)/* 将更改后的记录重新写入指定的磁盘文件中 */
{
printf( "can not save!\n");
getch();
}
fclose(fp);
printf( "delete successfully!\n");
}
void insert()/* 自定义插入函数*/
{
int i,j,k,snum,m=0;
FILE *fp;
if ((fp=fopen( "d:\\data.txt", "ab+" ))==NULL)
{
printf( "can not open\n");
return ;
}
while (!feof(fp))
if (fread(&stu[m],LEN,1,fp)==1)
m++;
if (m==0)
{
printf( "no record!\n");
fclose(fp);
return ;
}
printf( "please input the position where you want to insert!\n");
scanf( "%d" ,&snum);/* 输入要插入的位置*/
for (i=0;i<m;i++)
if (snum==stu[i].num)
break ;
for (j=m-1;j>i;j--)
stu[j+1]=stu[j];/* 从最后一条记录开始均向后移一位*/ printf( "please input the new information:\n");
printf( "number:" );
scanf("%d" ,&stu[i+1].num);
for (k=0;k<m;k++)
if (stu[k].num==stu[i+1].num&&k!=i+1)
{
printf( "the number is existing,press any to continue!");
getch();
fclose(fp);
return ;
}
printf( "please input per centum:");
printf( "\nelective:");
scanf( "%f" ,&Felec);
printf( "\nexperiment:");
scanf( "%f" ,&Fexpe);
printf( "\nrequired course:");
scanf( "%f" ,&Frequ);
printf( "name:\n" );
scanf("%s" ,&stu[i+1].name);
printf( "\nelective:");
scanf("%lf" ,&stu[i+1].elec);
printf( "\nexperiment:");
scanf("%lf" ,&stu[i+1].expe);
printf("\nrequired course:");
scanf("%lf" ,&stu[i+1].requ);
stu[i+1].sum=stu[i+1].elec*Felec+stu[i+1].expe*Fexpe+stu[i+1].requ*Frequ;/*计算总成绩*/
if ((fp=fopen( "d:\\data.txt", "wb" ))==NULL)
{
printf( "can not open\n");
return ;
}
for (k=0;k<=m;k++)
if (fwrite(&stu[k],LEN,1,fp)!=1)/* 将修改后的记录写入磁盘中*/
{
printf( "can not save!");
getch();
}
fclose(fp);
}
void sort()/* 自定义排名函数*/
{
struct student temp;
FILE *fp;
int i,j,m=0;
if ((fp=fopen( "d:\\data.txt", "ab+" ))==NULL)/* 判断文件是否打开成功*/ {
printf( "can not open\n");
return ;
}
while (!feof(fp))
if (fread(&stu[m],LEN,1,fp)==1)
m++;/* 统计学生个数*/ if (m==0)
{
printf( "no record!\n");
fclose(fp);
return ;
}
for (i=0;i<m-1;i++)
for (j=i+1;j<m;j++)
if (stu[j].sum>stu[i].sum)
{
temp=stu[i];
stu[i]=stu[j];
stu[j]=temp;
}
for (i=0;i<m;i++)
if (fwrite(&stu[i],LEN,1,fp)!=1)
{
printf( "can not save!");
getch();
return ;
}
fclose(fp);
}
void total()/* 自定义统计学生人数函数*/
{
FILE *fp;
int m=0;
if ((fp=fopen( "d:\\data.txt", "ab+" ))==NULL)/* 判断文件是否打开成功*/ {
printf( "can not open\n");
return ;
}
while (!feof(fp))
if (fread(&stu[m],LEN,1,fp)==1)
m++;/* 统计学生个数*/ if (m==0)
{
printf( "no record!\n");
fclose(fp);
return ;
}
printf( "the class are %d students!\n");/* 将统计的个数输出*/
fclose(fp);
}。