C# finding a whole number

[-kat-]

Hi I was hoping someone might be able to help me.

I have to write a program in C#. part of that program is finding out whether a year is a leap year or not. Now I know that if you divide the year by 4 and it comes back with a whole integer number that it is a leap year.

My question is how can I check that the number it comes back with is a whole integer number?

[BC_Programmer]

Now I know that if you divide the year by 4 and it comes back with a whole integer number that it is a leap year.

First- this is actually not the entire rule.

A year is a leap year if it's evenly divisible by 4 but not by 100


if (year modulo 4 is 0) and (year modulo 100 is not 0) or (year modulo 400 is 0)
       then is_leap_year
else
       not_leap_year


Anyway- the answer to your problem is the C# modulus operator, %: for example, this function would determine if a year was a leapyear:

Code: [Select]

private bool IsLeap(int year)
        {
            if ((year % 4 == 0) && (year % 100 != 0) || (year % 400 == 0))
                return true;
            else
                return false;
   
        }
However- a better solution is to simply use the .NET framework. System.DateTime.IsLeapYear(int) will tell you if a specified year is a leap-year.

[Salmon Trout]

However- a better solution is to simply use the .NET framework. System.DateTime.IsLeapYear(int) will tell you if a specified year is a leap-year.

Better - but not so much math practice involved... the teacher of the C# class might give -kat-'s homework a low mark if he or she did that!

[BC_Programmer]

Better - but not so much math practice involved... the teacher of the C# class might give -kat-'s homework a low mark if he or she did that!

Yes, that's why I included the other stuff .