题解 | #获得月份天数#

#include <stdio.h>

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