freepascal.compiler/docs/refex/ex27.pp

Program Example27;

{ Program to demonstrate the Frac function. }

Var R : Real;

begin
  Writeln (Frac (123.456):0:3);  { Prints  O.456 }
  Writeln (Frac (-123.456):0:3); { Prints -O.456 }
end.