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Applies to: ~>0.1
function IsWholeNumber: Boolean;
The IsWholeNumber method checks if a TFraction instance represent a whole number and returns True if so or False if not.
When a fraction is a whole number its numerator is an exact integer multiple of its denominator.
var F: TFraction; begin F := TFraction.Create(-2, 2); // F = -2/2 = -1 - 0/2 = -1 Assert(F.IsWholeNumber); F := TFraction.Create(12, 4); // F = 12/4 = 3 + 0/4 = 3 Assert(F.IsWholeNumber); F := TFraction.Create(7, 4); // F = 7/4 = 1 + 3/4 Assert(not F.IsWholeNumber); F := 42; Assert(F.IsWholeNumber); // F = 42/1 = 42 + 0/1 = 42 F := 0; Assert(F.IsWholeNumber); // F = 0/1 = 0 + 0/1 = 0 end;
Another test for a whole number fraction is to check whether its FractionalPart property is equal to 0. If this property is zero then the fraction is a whole number.