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//Rextester.Program.Main is the entry point for your code. Don't change it. //Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5 using System; using System.Collections.Generic; using System.Linq; using System.Text.RegularExpressions; namespace Rextester { public class Program { public static void Main (string[] args) { Console.WriteLine ("See if number is prime."); string readNumber = Console.ReadLine(); int useNumber = Int32.Parse(readNumber); string result = Calculate(useNumber); Console.WriteLine(result); } public static string Calculate(int number){ string isPrime = "Is Prime"; string notPrime = "Not Prime"; int checkNumber = (2^number-2)%number; if (checkNumber == 0) return isPrime; else return notPrime; } } }
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