题解 | #获得月份天数#

#include <stdio.h>

int main() {
    int year , month , two = 28;
    while(scanf("%d %d ",&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;
}