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× C# Examples


If a number is multiplied by itself (n*n), the final number will be the square of that number and finding the square root of a number is inverse operation of squaring the number. If x is the square root of y, it can be expressed as below:

square root

Alternatively, it can also be expressed as:

x2 = y

Method 1: Using Sqrt() method of C# Math Class

The Sqrt() method of C# Math class can be used to return square root of a number.

using System;

class MyProgram {
  static void Main(string[] args) {
    double x = 16;
    double y = 25;

    //Sqrt() takes double datatype as argument
    double x1 = Math.Sqrt(x);
    double y1 = Math.Sqrt(y);
    Console.WriteLine("Square root of " + x + ": " + x1);
    Console.WriteLine("Square root of " + y + ": " + y1);
  }
}

The above code will give the following output:

Square root of 16: 4
Square root of 25: 5

Method 2: Using Pow() method of C# Math Class

The Pow() method of C# Math class can also be used to calculate square root of a number.

using System;

class MyProgram {
  static void Main(string[] args) {
    double x = 16;
    double y = 25;

    //Pow() takes double datatype as argument
    double x1 = Math.Pow(x, 0.5);
    double y1 = Math.Pow(y, 0.5);
    Console.WriteLine("Square root of " + x + ": " + x1);
    Console.WriteLine("Square root of " + y + ": " + y1);
  }
}

The above code will give the following output:

Square root of 16: 4
Square root of 25: 5