Question

When compiled with Delphi 2009 and run, this console application writes “strange”.
The values on both sides of the “less than” operator are equal, but the code behaves as if they are not equal. What can I do to avoid this problem?

program Project5;

{$APPTYPE CONSOLE}

var
  C: Currency;
begin
  C := 1.32;

  if C < 1.32 then
  begin
    WriteLn('strange');
  end;

  ReadLn;
end.

p.s. code works fine with other values.

This answer by Barry Kelly explains that the Currency type “is not susceptible to precision issues in the same way that floating point code is.”

Answer 1

As fas as hard casting like Currency(1.32) is not possible, you could use the following for explicit casting

Function ToCurrency(d:Double):Currency;
    begin
       Result := d;
    end;

procedure TForm1.Button1Click(Sender: TObject);

var
  C: Currency;

begin
  C := 1.32;
  if C < ToCurrency(1.32) then
  begin
    Writeln ('strange');
  end;
end;

another way could by forcing the usage of curreny by usage of a const or variable

const
  comp:Currency=1.32;
var
  C: Currency;
begin
  C := 1.32;
  if C < comp then
  begin
    writeln ('strange');
  end;
end;