从键盘输入某年某月，输出该年的该月拥有的天数

从键盘输入某年某月，输出该年的该月拥有的天数。

#include<>

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