题解 | #获得月份天数#

#include <stdio.h>

int Leap(int year);

int main() {
    int mon = 0;
    int year = 0;

    while ( 2== scanf("%d %d", &year, &mon))
    {
        if (4 == mon || 6 == mon || 9 == mon || 11 == mon)
        {
            printf("30");
        }
        else if (2 == mon)
        {
            if (Leap(year))
            {
                printf("29");
            }
            else
            {
                printf("28");
            }
        }
        else 
        {
            printf("31");
        }
        printf("\n");
    }

    return 0;
}

int Leap(int year)
{
    return ((year % 100 != 0 && year % 4 == 0) || (year % 400 == 0));
}