02.PrimitiveDataTypesVariables/13.NullValuesArithmetic

//Problem 13.   Null Values Arithmetic
//Create a program that assigns null values to an integer and to a double variable. Try to print these variables at the console. Try to add some number or the null literal to these variables and print the result.

using System;

class NullValuesArithmetic
{
    static void Main()
    {
        int? nullValueFirst = null;
        double? nullValueSecond = null;
        Console.WriteLine("First variable is {0} and Second variable is {1}", nullValueFirst, nullValueSecond);
        Console.WriteLine(nullValueFirst + nullValueSecond);
        Console.WriteLine(nullValueFirst + 10);
        nullValueFirst = 2;
        Console.WriteLine(nullValueFirst.GetValueOrDefault());
    }
}