采用C++编写程序输入年号和月份，输出该月有多少天？

#include
#include
using namespace std;
int main()
{
int year,month,day;
cout << "请输入年份和月份" << endl;
cin >> year >> month;

if (month == 1 || month == 3 ||
month == 5 || month == 7 ||
month == 8 || month == 10 || month == 12)
{
day = 31;
}
else if (month == 2)
{
if ((year%4==0 && year%100!=0) || year%400==0)
day = 29;
else day = 28;
}
else day = 30;
cout << year << "年" << month << "月" << "有" << day << "天" << endl;
return 0;
}