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Equal operator overload

Project: Fractions

Unit: DelphiDabbler.Lib.Fractions

Record: TFraction

Applies to: ~>0.1

class operator Equal(const A, B: TFraction): Boolean;


This operator overload permits TFractions to be tested for equality using the = operator.

Two fractions are considered equal if they can be simplified to the same fraction. For example 1/2 = 2/4. Formally, two fractions are equal if their 1st and 2nd cross products are equal.

A TFraction can also be compared to integer and floating point types using the = operator. The Implicit operator takes care of converting the integer and floating point operands to TFraction before performing the comparison.


  F1, F2, F3, F4: TFraction;
  D: Double;
  I: Integer;
  F1 := TFraction.Create(1, 4);
  F2 := TFraction.Create(1, 4);
  F3 := TFraction.Create(2, 8);
  F4 := TFraction.Create(3, 1);
  D := 0.25;
  I := 3;
  Assert(F1 = F2);
  Assert(F1 = F3);
  Assert(D = F1);
  Assert(F1 = D);
  Assert(I = F4);
  Assert(F4 = I);

See Also