l3_8.cpp

《C++程序设计教程》电子教案及例题源码

#include <iostream.h>
void main()
{ 
	int year,month,days;
	cout << "请输入年和月，用空格分隔" ; 
	cin >> year >> month;
	switch(month)
	{
	case 1:
	case 3:
	case 5:
	case 7:
	case 8:
	case 10:
	case 12:  
		days = 31;
		break;
	case 4:
	case 6:
	case 9:
	case 11:
		days = 30;
		break;
	case 2:
		if( ( (year%4 == 0)&&(year%100 != 0) ) || (year%400 == 0) )
			days = 29;
		else
			days = 28;
		break;
	default:
		days = 0;
		break;
	}

    if(days ==0)
		cout << "月份输入有误！" <<endl;
	else
		cout << "该月份有 " << days << "天。" << endl;
}