C# .Sqrt()

The Math.Sqrt() method returns the square root of the number given.

Syntax

Math.Sqrt(x);

The method takes only one parameter, the variable x, of type double. The function will return a positive value of type double unless the value passed is one of the following:

• If x is negative, the function will return NaN (not a number).
• If x is NaN, the function will return NaN.
• If x is PositiveInfinity, the function will return PositiveInfinity.

Example

The following example demonstrates the Math.Sqrt() method. Four different values are passed to the method, and the return values are printed with the Console.WriteLine() method.

using System;

namespace MySquareRoot {
  public class Example {
    public static void Main(string[] args) {
      double a = Math.Sqrt(256);
      double b = Math.Sqrt(-256);
      double c = Math.Sqrt(500);
      double d = Math.Sqrt(0.144);

      Console.WriteLine(a);
      Console.WriteLine(b);
      Console.WriteLine(c);
      Console.WriteLine(d);
    }
  }
}

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This example results in the following output:

16
NaN
22.3606797749979
0.379473319220205

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Codebyte Example

The following example is runnable and uses the Math.Sqrt() method to return a double type value of the square root of 100:

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