From: Florian Frank <flori@...>
Date: 2005-04-15T07:08:53+09:00
Subject: Re: when 1.6 != 1.6? -- newbie

Mel Bohince wrote:

> Any clues to what I'm doing wrong?


When you're using assert_equal, you're comparing two floating point
numbers with ==. That's usually a bad idea, because rounding errors
can/will occur. Try using assert_in_delta(number1, number2, delta), to
find out, if |number1 - number2| <= delta instead.

Another tip: If you want to represent prices in your programs, don't use
floats at all. Use integers for the representation of the cent values
and all computations, and divide by 100 only for the string
representation of the numbers.

-- 
Florian Frank