Introduction
I have used Visual Studio 2012 for debugging purpose. But you can use any version of visul studio as per your availability..
using System; public class functionexcercise { public static void interchangenumber(ref int num1, ref int num2) { int newnum; newnum = num1; num1 = num2; num2 = newnum; } public static void Main() { int n1, n2; Console.Write("Enter two number: "); n1 = Convert.ToInt32(Console.ReadLine()); n2 = Convert.ToInt32(Console.ReadLine()); interchangenumber(ref n1, ref n2); Console.WriteLine("After swapping the 1st number is : {0} , and the 2nd number is : {1}", n1, n2); Console.ReadLine(); } }