﻿

//Problem 12. 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? a = null;
        double? b = null;

        Console.WriteLine("{0}, {1}", a, b);

        a += 10;
        b += 15D;

        Console.WriteLine("{0}, {1}", a, b);
    }
}

