float :frac ( float $NUMBER )

Returns the fractional part of a real number.

# :frac example
:writeln :frac f+3.3   # Should be +0.3
:writeln :frac f+3.9   # Should be +0.9
:writeln :frac f-4.1   # Should be -0.1
:writeln :frac f-4.8   # Should be -0.8