How to compare two double values in C#

Lines 10–12: We instantiate the double variables d1 , d2 , and d3 and initialize them with values.
Line 15: We compare d1 to d2 , and it returns 0 .
Line 16: We compare d1 to d3 , and it returns -1 .
Line 17: We compare d3 to d1 , and it returns 1 .

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// use System
using System;
// create class
class DoubleComparer
{
    // main method
    static void Main()
    {
      // create double values
      double doubleNumberOne = 23.454;
      double doubleNumberTwo = doubleNumberOne * 1;
      double doubleNumberThree = 45.34;
      // comparing values and printing results
      Console.WriteLine(doubleNumberOne.CompareTo(doubleNumberTwo));  // 0 : Equal
      Console.WriteLine(doubleNumberOne.CompareTo(doubleNumberThree));  // -1 : lesser than
      Console.WriteLine(doubleNumberThree.CompareTo(doubleNumberOne));  // 1 : greater than
    }
}