How to generate random or pseudo-random floats? [closed]

I'm trying to make a particle system which uses mainly floating points for position, velocity etc. I need a random number generator to generate random floats for some of those values.

I've tried random(), but its data types are long, so the floats are rounded to 0. This is Arduino (which is on C++11), so it's a bit different from average C++, as in you cannot use <iostream>, <random> etc.