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# include <stdio.h>
# include <stdlib.h>
# include <string.h>
struct course //先定义两个结构体^_^,一个是课程信息，另外一个是学生选课的结构图。
{
int num ; //课程编号
char name [ 20 ] ; //课程名称
char kind [ 10 ] ; //课程性质
int time ; //总学时
int ttime ; //授课学时
int etime ; //实验上级学时
int mark ; //学分
int term ; //学期
} ;
struct student
{
int snum ; //学号
int cnum ; //课程编号
char cname [ 20 ] ; //课程名称
} ;
int main ( void ) //登录界面
{
int a , b , c = 123 , d = 123 ;
printf ( " 请输入本程序防盗安全账号密码登录系统(防盗安全账号、密码为123)； \n " ) ; //虽然没啥用
printf ( " 账号； " ) ;
scanf ( " %d " , & a ) ;
printf ( " \n " ) ;
printf ( " 密码； " ) ;
scanf ( " %d " , & b ) ;
printf ( " \n " ) ;
while ( a ! = c )
{
printf ( " 账号错误！请重新输入！ \n 账号； " ) ;
scanf ( " %d " , & a ) ;
}
while ( b ! = d )
{
printf ( " 密码错误！请重新输入！ \n 密码； " ) ;
scanf ( " %d " , & b ) ;
}
printf ( " 登录成功^_^ \n " ) ;
system ( " cls " ) ; //清屏
mai_n ( ) ; //主菜单
return 0 ;
}
