Random walk program

[giblit]

Again num 4 is alawys 0 so that would mean num3 is always either -1 or 1. If you wish to do it you will either have to add that to the other num3

num3 += num4 - 1;
num3 += num4 + 1;

or modify num4 before assigning to num3.

--num4;
num3 = num4;

though as I mentioned it would be best to just modify num3 directly and not use num4.

++num3;
--num3;