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Negative operator overload

Project: Fractions

Unit: DelphiDabbler.Lib.Fractions

Record: TFraction

Applies to: ~>0.1

class operator Negative(const F: TFraction): TFraction;


This operator overload enables the unary negative (negation) operator - to be applied to a TFraction.

The operator returns a copy of the fraction with its sign changed.


  F, FNeg: TFraction;
  F := TFraction.Create(3, 4);
  FNeg := -F;
  Assert((FNeg.Numerator = -3) and (FNeg.Denominator = 4));
  F := TFraction.Create(-3, 4);
  FNeg := -F;
  Assert((FNeg.Numerator = 3) and (FNeg.Denominator = 4));
  F := TFraction.Create(0, 1);
  FNeg := -F;
  Assert((FNeg.Numerator = 0) and (FNeg.Denominator = 1));

See Also