?? 2-21.c
字號:
#include<stdio.h>
void main(void)
{
int year,month,days,flag;
printf("input year,month:\n");
scanf("%d%d",&year,&month);
flag=1;
switch(month)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
days=31;
break;
case 4:
case 6:
case 9:
case 11:
days=30;
break;
case 2:
if(!(year%4)&&year%100||!(year%400))
days=29;
else
days=28;
break;
default:
flag=0;
}
if(!flag)
printf("error input data\n");
else
printf("days=%d\n",days);
}
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