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​

using System;

​

public class HelloWorld

{

    public static void swapInteger(int firstNum, int secondNum)

    {

        int temp = secondNum;

        secondNum = firstNum;

        firstNum = temp;

        Console.WriteLine($"firstNum: {firstNum}   secondNum: {secondNum}");

    }

    public static void Main(string[] args)

    {

        int numberOne = 99;

        int numberTwo = 500;

        Console.WriteLine($"numberOne: {numberOne}   numberTwo: {numberTwo}");

        swapInteger(numberOne, numberTwo);

        Console.WriteLine($"numberOne: {numberOne}   numberTwo: {numberTwo}");

    }

}