View difference between Paste ID: 5hE3Jcnh and X3adrrhP

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 
 namespace Second___Easy
 {
     class Program
     {
         static void Main(string[] args)
         {
             Console.Write("Write function (+ - * / % ^): ");
             string operation = Console.ReadLine();
             Console.Write("Write FIRST value (use prefix \"h\" for hexadecimal or \"b\" for binary number): ");
             string firstValue = Console.ReadLine();
             Console.WriteLine("Write SECOND value (use prefix \"h\" for hexadecimal or \"b\" for binary number): ");
             string secondValue = Console.ReadLine();
 
             int firstNumber = ParseNumber(firstValue);
             int secondNumber = ParseNumber(secondValue);
 
             int result;
             switch (operation)
             {
                 case "+":
                     result = firstNumber + secondNumber;
                     break;
                 case "-":
                     result = firstNumber - secondNumber;
                     break;
                 case "*":
                     result = firstNumber * secondNumber;
                     break;
                 case "/":
                     result = firstNumber / secondNumber;
                     break;
                 default:
                     Console.WriteLine("Unknown operation");
                     return;
             }
 
             Console.WriteLine();
             Console.WriteLine();
 
             string[] firstOutput = GetAllFormats(firstNumber);
             string[] secondOutput = GetAllFormats(secondNumber);
             string[] resultOutput = GetAllFormats(result);
 
             Console.WriteLine("In decimal");
             Console.WriteLine("{0} {1} {2} = {3}", firstOutput[0], operation, secondOutput[0], resultOutput[0]);
             Console.WriteLine();
             Console.WriteLine("In binary");
             Console.WriteLine("{0} {1} {2} = {3}", firstOutput[1], operation, secondOutput[1], resultOutput[1]);
             Console.WriteLine();
             Console.WriteLine("In hexadecimal");
             Console.WriteLine("{0} {1} {2} = {3}", firstOutput[2], operation, secondOutput[2], resultOutput[2]);
             Console.WriteLine();
 
             Console.ReadKey();
         }
 
         private static string[] GetAllFormats(int result)
         {
             string[] retVal = new string[3];
             retVal[0] = result.ToString();
             retVal[1] = Convert.ToString(result, 2);
             retVal[2] = Convert.ToString(result, 16);
             return retVal;
         }
 
         private static int ParseNumber(string value)
         {
             if (value[0] == 'b' || value[0] == 'B')
             {
                 value = value.Substring(1);
                 return Convert.ToInt32(value, 2);
             }
 
             if (value[0] == 'h' || value[0] == 'H')
             {
                 value = value.Substring(1);
                 return Convert.ToInt32(value, 16);
             }
 
             return int.Parse(value);
         }
     }
 }