This is a new site that's currently running on alpha code. There are going to be bugs. If you discover any, please report them on the site's issues page (GitHub account required). Thanks.
Warning: Many URLs are going to change. Refer to the README file to discover which library project's documentation has been completed.
Project: Fractions
Unit: DelphiDabbler.Lib.Fractions
Record: TFraction
Applies to: ~>0.1
class operator Subtract(const A, B: TFraction): TFraction;
This operator overload permits one TFraction to be subtracted from another using the - operator.
The result of the subtraction is returned as a new TFraction instance, reduced to its lowest terms.
One of the operands may be either an integer or floating point value. The Implicit operator takes care of converting the integer and floating point operands to a TFraction before performing the subtraction.
var
F1, F2, FRes: TFraction;
begin
F1 := TFraction.Create(2, 3);
F2 := TFraction.Create(5, 6);
FRes := F1 - F2; // 2/3 - 5/6 = 4/6 - 5/6 = -1/6
Assert((FRes.Numerator = -1) and (FRes.Denominator = 6));
F2 := TFraction.Create(-5, 6);
FRes := 1 - F2; // 1 - -5/6 = 6/6 - -5/6 = 11/6
Assert((FRes.Numerator = 11) and (FRes.Denominator = 6));
F1 := TFraction.Create(3, 4);
FRes := F1 - 0.25; // 3/4 - 0.25 = 3/4 - 1/4 = 2/4 = 1/2
Assert((FRes.Numerator = 1) and (FRes.Denominator = 2));
end;