题解 | #获得月份天数#

#include <stdio.h>

int main() {
    int year =0;
    int month=0;
    int day=0;
   while(scanf("%d %d\n",&year,&month)!=EOF) 
   {
    switch(month)
    {
       
        case 1:printf("31\n");break;
         case 2:if(year%4==0&&year%100!=0||year%400==0)
                    printf("29\n");
                    else
                     printf("28\n");
                 break;
          case 3:printf("31\n");break;
           case 4:printf("30\n");break;
            case 5:printf("31\n");break;
             case 6:printf("30\n");break;
              case 7:printf("31\n");break;
               case 8:printf("31\n");break;
               case 9:printf("30\n");break;
             case 10:printf("31\n");break;
              case 11:printf("30\n");break;
               case 12:printf("31\n");break;

    }

   }
    return 0;
}