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# IsWholeNumber method

Project: Fractions

Unit: DelphiDabbler.Lib.Fractions

Record: TFraction

Applies to: ~>0.1

``````function IsWholeNumber: Boolean;
``````

## Description

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.

### Example

``````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;
``````

##= Note

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.