[Edit]

C# / .NET - check if number is odd

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Created by:

Theodora-Battle

528

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

Quick solution:

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

Odd numbers:

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... -7  -5  -3  -1   1   3   5   7 ...

Practical example

Edit

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

C# / .NET - check if number is odd

Practical example

Alternative solution

See also

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