Determine Leap Year

Today is a special day which comes only after four years -29th Feb. So I thought I should write something about leap year.

First, what is leap year?

· The year must be divisible by 4 and must NOT be divisible by 100.

· The year must be divisible by 400.

In C# we have already defined function name

IsLeapYear(int year)

It is static fuction.

Namespace: System

 Assembly:  mscorlib (in mscorlib.dll)

Parameters:

year

Type: System.Int32
A 4-digit year.

Return Value:

Type: System.Booleantrue if year is a leap year; otherwise, false.

Usage:

Example 

Determine how many leap year from within a range of two years.

public int countLeapYear(int startYear,int EndYear)

{

     int intCount = 0;

    for (int year = startYear; year <= EndYear; year++)

     {

        if (DateTime.IsLeapYear(year))

       {

          intCount = intCount + 1;

       }

    }

      return intCount;

 }

Now you can call this function by passing two year values as parameters.

suppose I want from 2001 to 2099 how many leap year

countLeapYear(2001,2099)

It will return 24.

cheers.....