题解 | #获得月份天数#

#include <stdio.h>

int is_leap_year(int y)//判断是否是闰年
{
    if ((y % 400 == 0) || ((y % 100 != 0) && (y % 4 == 0)))
    {
        return 1;
    }
    return 0;
}
int main()
{
    int y = 0;
    int m = 0;
    int d[] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };//各月天数
    while (scanf("%d %d", &y, &m) != EOF)
    {
        d[2] = is_leap_year(y) ? 29 : 28;
        printf("%d\n", d[m]);//因为首元素为零，所以调用时不用m-1
    }
    return 0;
}