How to use fmod and avoid precision issues

Question

I\'m going to boil this problem down to the simplest form:

Let\'s iterate from [0 .. 5.0] with a step of 0.05 and print out \'X\' for every 0.25 multipl

Answer 1

I'd solve this by simply not using floating point variables in that way:

for (int i = 0; i <= 500; i += 5) {
  double d = i / 100.0;  // in case you need to use it.
  if ((i % 25) == 0)
    print 'X';
}

They're usually problematic enough that it's worth a little extra effort in avoiding them.