Question

I have declared an int e.g. int i;

I have a method that is looped:

 public static void NumberUp(int i)
    {
        i++;
        System.Console.WriteLine(i);
...
}

although each time the number is returned, it is always 1. Not 1,2,3 and so on..

I would have imagined that “i” increases by one which each run of the method?

Answer 1

You can pass the variable by reference.

public static void NumberUp(ref int i)
{
   i++;
   System.Console.WriteLine(i);
   ...
}

This, however is bad design, as you now have a method with a side effect on the passed in parameter (which the method name doesn’t indicate) – something that can catch other programmers by surprise.

It would be a better design to return the incremented value:

public static int NumberUp(ref int i)
{
   return i + 1;
}