#include <stdio.h>
#include <stdlib.h>
int main()
{
int x, y, z;
printf("请输入一个年份和月份：");
scanf("%d %d",&x,&y);
if(y>0 && y<=12)
{
switch(y)
{
case 2:
if(y==2&&(0 == x%4) && (0 != x%100) ||(0 == x%400))
{
printf("该月有29天！");
}
else
{
printf("该月有28天！");
}
break;
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:printf("该月有31天！");break;
case 4:
case 6:
case 9:
case 11:printf("该月有30天！");break;
}
}
else
{
printf("输入的是非法值！");
}
return 0;
}
