5-12.c

一些简单的c51程序

#include <stdio.h>
int exit();
main()
{
enum week {sun,mon,tur,wed,thu,fri,sat};
enum week yesterday,tomorrow;
 int i;
 printf("\n请输入0-6内的整数： ");
 scanf("%d",&i);
 if((i<0)||(i>6))
{
printf("/n数据输入错误");
exit();
}
 else 
switch (i)
{
case 0:yesterday=sat;tomorrow=mon;break;
case 1:yesterday=sun;tomorrow=tur;break;
case 2:yesterday=mon;tomorrow=wed;break;
case 3:yesterday=tur;tomorrow=thu;break;
case 4:yesterday=wed;tomorrow=fri;break;
case 5:yesterday=thu;tomorrow=sat;break;
case 6:yesterday=fri;tomorrow=sun;break;
default: break;
}
printf("");
}

int exit()
{
}