Problem

Write a short program that takes a year as input from the user, and then determines whether or not that particular year is (or was) a leap year. As a reminder, here is the criteria that dictates whether or not a year is a leap year: If the year is evenly divisible by 4, then the year is a leap year -- unless it is also divisible by 100, in which case it is not. An exception to this is if the year is divisible by 400, then it is still a leap year.

Example:
1996 was a leap year because it was divisible by 4.
1900 was not a leap year in spite of being divisible by 4, because it is also divisible by 100.
2000 was a leap year because it is divisible by 400.
2009 was not a leap year, because it is not divisible by 4.

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Solution

The solution...

Code

Solution Code

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String input;
int year;

input = JOptionPane.showInputDialog( "Enter a year:" );
year = Integer.parseInt( input );

//first, check if it's a leap year. For it to be a leap year, 
//it needs to either be divisible by 4 and NOT by 100, or be divisible by 400
if ( ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0) )
	JOptionPane.showMessageDialog( null, year + " is a leap year! :)", "Leap Year!", JOptionPane.INFORMATION_MESSAGE );
else //it is not a leap year
	JOptionPane.showMessageDialog( null, year + " is not a leap year. :(", "No Leap Year", JOptionPane.INFORMATION_MESSAGE );