从键盘输入某年某月（包括闰年），编程输出该年的该月拥有的天数

从键盘输入某年某月（包括闰年），编程输出该年的该月拥有的天数。

**输入格式要求："%d,%d" 提示信息：“Input year,month:” “The number of days is %d\n”
**输出格式要求："%d"
程序运行示例1如下：
Input year,month:1984,2
The number of days is 29
程序运行示例2如下：
Input year,month:2000,2
The number of days is 29
程序运行示例3如下：
Input year,month:1985,2
The number of days is 28
程序运行示例4如下：
Input year,month:1983,13
Input year,month:1983,-1
Input year,month:1983,1
The number of days is 31

#include
#define MONTHS 12

int main(void)
{
    int days[2][MONTHS] = {{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}, 
	{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}};
    int year, month;
    do
    {
        printf("Input year,month:");
        scanf("%d,%d", &year, &month );
    }
    while (month < 1 || month > 12);
    if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0))
        printf("The number of days is %d\n", days[1][month - 1]);
    else
        printf("The number of days is %d\n", days[0][month - 1]);
    return 0;
}