C++ 程序查找闰年

编写一个 C++ 程序，通过示例查找闰年。在此闰年示例中，我们使用 If 语句来检查 

• year % 400 等于 0 – 可被 400 整除的年份是闰年。
• ( year % 4 == 0 ) && ( year % 100 != 0)) – 任何可被 4 整除但又不是世纪年份的年份，则是闰年。

#include<iostream>
using namespace std;

int main()
{
	int year;
	
	cout << "\nPlease Enter the Year to Check the Leap Year =  ";
	cin >> year;
	
	if (( year % 400 == 0) || (( year % 4 == 0 ) && ( year % 100 != 0)))
	{
		cout << "\n" << year << " is a Leap Year";
	}
	else
	{
		cout << "\n" << year << " is Not a Leap Year";
	}

 	return 0;
}

让我再检查一下。

Please Enter the Year to Check the Leap Year =  2020

2020 is a Leap Year

下面的程序接受一个整数，并使用 Else If 语句查找它是闰年还是非闰年。

#include<iostream>
using namespace std;

int main()
{
	int year;
	
	cout << "\nPlease Enter the Year to Check =  ";
	cin >> year;
	
	if (year % 400 == 0)
	{
		cout << "\n" << year << " is a Leap Year";
	}
	else if ( year%100 == 0)
	{
		cout << "\n" << year << " is Not a Leap Year";
	}
	else if ( year % 4 == 0 )
	{
		cout << "\n" << year << " is a Leap Year";
	}
	else
	{
		cout << "\n" << year << " is Not a Leap Year";
	}

 	return 0;
}

Please Enter the Year to Check =  2024

2024 is a Leap Year

此 程序 有助于使用嵌套 If 语句检查年份是否为闰年。

#include<iostream>
using namespace std;

int main()
{
	int year;
	
	cout << "\nPlease Enter the Year to Check =  ";
	cin >> year;
	
	if(year % 4 == 0)
	{
		if( year % 100 == 0) 
		{
			if ( year % 400 == 0)
			{
				cout << "\n" << year << " is a Leap Year";
			}
			else
			{
				cout << "\n" << year << " is Not a Leap Year";
			}
		}
		else
		{
			cout << "\n" << year << " is a Leap Year";
		}
	}
	else
	{
		cout << "\n" << year << " is Not a Leap Year";
	}

 	return 0;
}

Please Enter the Year to Check =  2016

2016 is a Leap Year