Frac

Explanation
The frac function returns the fractional part of x, that is the part behind the dot. If there is nothing behind the dot then it returns 0. If the argument is negative, the result of this function is also negative. This function can be transcribed by the following equation:

frac(x) = x - (x div 1)

Examples
Here are some example results:

frac(98.62) returns the value 0.62 frac(-45.23) returns the value -0.23 frac(46) returns the value 0