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C# / .NET - Math.Sqrt() method example

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Created by:
Elleanor-Williamson
230

Math Sqrt is a static method that returns a number which is the square root of input value. The method works only on positive real numbers.

using System;

public class Program
{
    public static void Main(string[] args)
    {
        Console.WriteLine( Math.Sqrt(  4   ) ); //  2
        Console.WriteLine( Math.Sqrt(  9   ) ); //  3

        Console.WriteLine( Math.Sqrt(  2   ) ); //  1.4142135623730951
        Console.WriteLine( Math.Sqrt(  0.5 ) ); //  0.7071067811865476
        Console.WriteLine( Math.Sqrt(  0   ) ); //  0
        Console.WriteLine( Math.Sqrt( -1   ) ); //  NaN
    }
}

1. Documentation

Syntax
namespace System
{
    public static class Math
    {
        // ...
        public static double Sqrt(double number) { ... }
        // ...
    }
}
Parametersnumber - double value in the range 0 to +Infinity (primitive value).
Result

Square root number value in range 0 to +Infinity (primitive value).

If the operation can not be executed NaN is returned.

DescriptionSqrt is a static method that returns a number which is square root of input value. The method works only on positive real numbers.

2. Square root with Math.pow method examples

In this example, the way how to calculate square root using power function is presented. 

using System;

public class Program
{
    static double CalculateSqrt(double value)
    {
        return Math.Pow(value, 0.5);
    }

    public static void Main(string[] args)
    {
        // Examples:
        Console.WriteLine( CalculateSqrt(  4   ) ); //  2
        Console.WriteLine( CalculateSqrt(  9   ) ); //  3

        Console.WriteLine( CalculateSqrt(  2   ) ); //  1.4142135623730951
        Console.WriteLine( CalculateSqrt(  0.5 ) ); //  0.7071067811865476
        Console.WriteLine( CalculateSqrt(  0   ) ); //  0
        Console.WriteLine( CalculateSqrt( -1   ) ); //  NaN
    }
}

Cross technology - Math.sqrt()

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