Get the Decimal part out of a float number

Question

I need to get the decimal part out of a float number, for example:

float x = 18.30;

I need a way to get the '.30' in another float.. so I will have a float equals to 18.30 and another one equals to .30

Any ideas?

Answer 1

I'm not sure if there is a function doing exactly the way you want but you can use this:

x - floor(x)

Answer 2

The accepted answer above (x - floor(x)) works for positive numbers but does not the right thing for negative numbers. Use trunc() instead:

x - trunc(x)

But the fmod() solution is the one to use if you ask me:

fmod(x, 1)