C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;
  public class Program
    {
        static double GetSquare(double a)
        {
            a = a * a;
            return a;
        }
        public static void Main()
        {
        Console.WriteLine("please input number to calculate :");
        double number = Convert.ToDouble(Console.ReadLine());
        Console.WriteLine("the area of the square is : " + GetSquare(number));
    }
    }

 
using System;
  public class Program
    {
        static double GetSquare(double a)
        {
            a = a * a;
            return a;
        }
        public static void Main()
        {
        Console.WriteLine("please input number to calculate :");
        double number = Convert.ToDouble(Console.ReadLine());
        Console.WriteLine("the area of the square is : " + GetSquare(number));
    }
    }

Hello World
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Cached Result
Last Run:	12:36:43 pm
Compile:	0.017s
Execute:	0.6s
Memory:	27.59Mb
CPU:	0.617s

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