题解 | #获得月份天数#

#include<stdio.h>
int main()
{
    int year,month;
    while(scanf("%d %d",&year,&month)!=EOF)
    {
        if(year%4==0)
      {
        switch(month)
        {
            case 1:
            case 3:
            case 5:
            case 7:
            case 8:
            case 10:
            case 12:printf("31\n");break;
            case 2:printf("29\n");break;
            default:printf("30\n");break;
        }
      }
        else
            switch(month)
        {
            case 1:
            case 3:
            case 5:
            case 7:
            case 8:
            case 10:
            case 12:printf("31\n");break;
            case 2:printf("28\n");break;
            default:printf("30\n");break;
            }
    }
    return 0;
    }