题解 | #获得月份天数#

#include<stdio.h>
int main()
{
  int y,m;
  while(scanf("%d %d",&y,&m)!=EOF)
  {
      switch(m)
    {
      case 1:
      case 3:
      case 5:
      case 7:
      case 8:
      case 10:
      case 12:printf("31\n");break;
      case 4:
      case 6:
      case 9:
      case 11:printf("30\n");break;
      case 2:
        if(y%400==0||(y%4==0&&y%100!=0))
            printf("29\n");
        else printf("28\n");break;
    }
  } 
 return 0;
}

判断是否为闰年是主要部分