How to actually avoid floating point errors when you need to use float?

Question

I am trying to affect the translation of a 3D model using some UI buttons to shift the position by 0.1 or -0.1.

My model position is a three dimensional float so sim

Answer 1

A simple solution is to either use fixed precision. i.e. an integer 10x or 100x what you want.

float f = 10;
f += 0.1f;

becomes

int i = 100;
i += 1;  // use an many times as you like
// use i / 10.0 as required.

I wouldn't use float in any case as you get more rounding errors than double for next to no benefit (unless you have millions of float values) double gives you 8 more digits of precision and with sensible rounding would won't see those errors.