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Read double from console and do the calculation

using System; using System.Collections.Generic; using System.Linq; using System.Text;     class Program     {         static void Main(string[] args)         {             double firstNumber, secondNumber;             string userName;             Console.WriteLine("Enter your name:");             userName = Console.ReadLine();             Console.WriteLine("Welcome {0}!", userName);             Console.WriteLine("Now give me a number:");             firstNumber = Convert.ToDouble(Console.ReadLine());             Console.WriteLine("Now give me another number:");             secondNumber = Convert.ToDouble(Console.ReadLine());             Console.WriteLine(firstNumber + secondNumber);             Console.WriteLine(firstNumber - secondNumber);             Console.WriteLine(firstNumber * secondNumber);             Console.WriteLine(firstNumber / secondNumber);             Console.WriteLine(firstNumber % secondNumber);         }     }