[Edit]

C# / .NET - check if number is even

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Created by:

Marcino

720

In this short article, we would like to show how check if number is even using C# / .NET.

Quick solution:

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int number = 5;
​
if (number % 2 == 0)
{
    // ...
}

Even numbers:

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... -8  -6  -4  -2   0   2   4   6   8 ...

Practical example

Edit

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using System;
​
public class Program
{
    public static void Main(String[] args)
    {    
        Console.WriteLine( NumberUtils.IsEven(0) );   // true      // even
        Console.WriteLine( NumberUtils.IsEven(1) );   // false
        Console.WriteLine( NumberUtils.IsEven(2) );   // true      // even
        Console.WriteLine( NumberUtils.IsEven(3) );   // false
        Console.WriteLine( NumberUtils.IsEven(4) );   // true      // even
        Console.WriteLine( NumberUtils.IsEven(5) );   // false
​
        Console.WriteLine( NumberUtils.IsEven(-1) );  // false
        Console.WriteLine( NumberUtils.IsEven(-2) );  // true      // even
        Console.WriteLine( NumberUtils.IsEven(-3) );  // false
        Console.WriteLine( NumberUtils.IsEven(-4) );  // true      // even
        Console.WriteLine( NumberUtils.IsEven(-5) );  // false
    }
}
​
public class NumberUtils
{
    public static bool IsEven(int number)
    {
        return number % 2 == 0;
    }
}

Alternative solution

Edit

In this section, you can find solution that uses bitwise operator.

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using System;
​
public class Program
{
    public static void Main(String[] args)
    {    
        Console.WriteLine( NumberUtils.IsEven(0) );   // true      // even
        Console.WriteLine( NumberUtils.IsEven(1) );   // false
        Console.WriteLine( NumberUtils.IsEven(2) );   // true      // even
        Console.WriteLine( NumberUtils.IsEven(3) );   // false
        Console.WriteLine( NumberUtils.IsEven(4) );   // true      // even
        Console.WriteLine( NumberUtils.IsEven(5) );   // false
​
        Console.WriteLine( NumberUtils.IsEven(-1) );  // false
        Console.WriteLine( NumberUtils.IsEven(-2) );  // true      // even
        Console.WriteLine( NumberUtils.IsEven(-3) );  // false
        Console.WriteLine( NumberUtils.IsEven(-4) );  // true      // even
        Console.WriteLine( NumberUtils.IsEven(-5) );  // false
    }
}
​
public class NumberUtils
{
    public static bool IsEven(int number)
    {
        return (number & 1) == 0;
    }
}

C# / .NET - check if number is even

Practical example

Alternative solution

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