using System;

​

public class MyProgram

{

    public static void Main(String[] args)

    {

        int iValue = 0;

        double rValue = 0.5;

        String sValue;

        Boolean bValue;

        sValue = ""; //<== Add this line

        bValue = false;

        iValue = 99 + 1;

        rValue = 5.5 / 3.3;

        sValue = iValue + "\n \t    " + rValue + "\n \t    " + bValue;

        Console.WriteLine("iValue = " + iValue);

        Console.WriteLine("rValue = " + rValue);

        Console.WriteLine("sValue = " + sValue);

        Console.WriteLine("bValue = " + bValue);

    }

}

​