Calculating leap years : <p>I have an assignment that is supposed to calculate whether a year that the user inputs is in fact a leap year. I cannot figure out the formula for this. Can anyone help? I can figure out the rest of the code but here is what is needed:</p>

<p><strong>The month of February normally has 28 days. But if it is a leap year, February has 29 days.
Write a program that asks the user to enter a year. The program should then display the
number of days in February that year. Use the following criteria to identify leap years:
1. Determine whether the year is divisible by 100. If it is, then it is a leap year if and only
if it is also divisible by 400. For example, 2000 is a leap year, but 2100 is not.
2. If the year is not divisible by 100, then it is a leap year if and only if it is divisible by 4.
For example, 2008 is a leap year, but 2009 is not.</strong></p>
