这是本人做的第一个实践项目，用的知识都是书上有的，没有很多很复杂的知识
同时因为没有学习 C语言 图形方面的知识，所以界面做得很丑，暂时先这样吧
源文件：
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "student.h"void main()
{
int num_order;
char c;num_order = msg();//输出相关信息,获取相关操作
while( num_order!=1 && num_order!=2 && num_order!=3)
{
printf("请重新输入正确参数:\n");
scanf("%d",&num_order);
}switch( num_order )
{
case 1: from_file(0); break;//查询
case 2: input_(); break;//录入
case 3: from_file(1); break;//修改
}c = getchar();//用于接受上一个回车符
printf("\n是否执行其他操作？\n是/Y、否/N\n");
c = getchar();
while( c == 89 || c == 121 )
{
printf("请输入相关参数\n");
scanf("%d",&num_order);
switch( num_order )
{
case 1: from_file(0); break;//查询
case 2: input_(); break;//录入
case 3: from_file(1); break;//修改
}
c = getchar();
printf("\n是否执行其他操作？\n是/Y、否/N\n");
c = getchar();
}}
Student.h
头文件：
#include <stdio.h>
#include <string.h>
#include <stdlib.h>int msg();//信息提示窗口
void input_();//录入相关信息
void save_files( struct Student_info *p );//保存内容至文件
void print_( struct Student_info *p, int n );//输出内容到屏幕
void from_file( int flag );//读取文件内容
void change_info( struct Student_info *p, int loop );//修改相关内容
void sort_info(struct Student_info *p);//排序struct Student_info
{
char name[10];
int id;
int age;
char adress[30];
};int num_stud;
int msg()//信息提示窗口
{
int n;printf("\t\t\t\t学生管理系统\n\n");
printf("\t\t 请输入你想执行的操作：\n");
printf("\t\t ╭════════════════╮ \n");
printf("\t\t║1.学生信息查询 ║\n");
printf("\t\t║2.学生信息录入 ║\n");
printf("\t\t║3.学生信息修改 ║\n");
printf("\t\t╰═════════════════╯\n");scanf("%d",&n);
return(n);
}void input_()//录入相关信息
{
int i;
struct Student_info *p,*into_save;system("cls");
printf("学生信息录入系统：\n");
printf("请输入想要录入信息的学生人数\n");scanf("%d",&num_stud);
if((into_save = p = ( struct Student_info *)malloc( num_stud * sizeof( struct Student_info ))) == NULL )
printf("创建空间失败！\n");
else
printf("依次输入学生学号 姓名 年龄 地址\n");
for( i = 0; i < num_stud ; i++, p++ )
{
scanf( "%d %s %d %s", &p->id, p->name, &p->age, p->adress);
}save_files( into_save );
}void save_files( struct Student_info *p )//内容保存
{
int i;
FILE *fp;
if( (fp = fopen( "stud.dat", "ab" )) != NULL )
{
for( i = 0; i < num_stud; i++, p++ )
{
fwrite( p , sizeof(struct Student_info), 1, fp);
}
fclose( fp );
printf( "信息录入完成！\n" );
}
else if( (fp = fopen( "stud.dat", "wb" )) == NULL )
{
printf( "文件创建失败！\n");
exit(0);
}
else
{
for( i = 0; i < num_stud; i++, p++ )
{
fwrite( p , sizeof(struct Student_info), 1, fp);
}
fclose( fp );
printf( "信息录入完成！\n" );
}
}void print_( struct Student_info *p, int n )//输出屏幕
{
int i;
printf( "学号\t姓名\t年龄\t地址\n\n");
for( i = 0; i < n ; i++, p++ )
{
printf( "%-4d %7s %6d %8s\n", p->id, p->name, p->age, p->adress);
}
printf("\n");
}void from_file( int flag )//读取文件内容
{
FILE *fp;
struct Student_info temp;
struct Student_info *p,*into_print,*first;
int i = 0;
int loop = 0;system("cls");
printf("\t学生信息查询 \n");if((fp = fopen("stud.dat","rb")) == NULL)
{
printf( "文件信息不存在\n" );
exit(0);
}while( !feof(fp) )
{
fread( &temp, sizeof(struct Student_info), 1, fp);
loop++;
}
loop-=1;//获取文件中内容个数rewind(fp);
first = into_print = p = (struct Student_info *)malloc(loop*sizeof(struct Student_info));
for( i = 0; i < loop; i++, p++ )
{
fread( p, sizeof(struct Student_info), 1 ,fp);
}print_( into_print, loop );
if( flag == 0 )
{
free( first );
first = into_print = p = NULL;
}
else
{
change_info( first, loop );
}
fclose(fp);
}void change_info( struct Student_info *p, int loop )
{
int n,i;
struct Student_info *t1,*t2;
FILE *fp;printf("请输入要修改学生信息的学号:\n");
scanf("%d",&n);
t2 = t1 = p;for( i = 0; i < loop; i ++, t1++ )
{
if( t1->id == n)
break;
}
scanf( "%d %s %d %s", &t1->id, t1->name, &t1->age, t1->adress);if( ( fp = fopen( "stud.dat", "wb") ) == NULL )
{
printf("文件写入错误！\n");
}
else
{
for( i = 0; i < loop; i ++, p++ )
{
fwrite( p, sizeof(struct Student_info), 1, fp );
}
}
fclose(fp);
printf("修改成功！\n");
free(t2);
}
运行界面：
1.首页
2.录入界面
3.查询界面
4.修改界面
注意看学号 102 的信息 已经改变
附上文件的链接:
链接：http://pan.baidu.com/s/1sjjSpy9
密码：kowr