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Re: RFA/PATCH gtest - NSNumber float != double

From: Alexander Malmberg
Subject: Re: RFA/PATCH gtest - NSNumber float != double
Date: Tue, 21 Jan 2003 23:43:17 +0100

David Ayers wrote:
> Hello everyone,
> I'm working on a set of GDL2 guile tests and ran into a base issue.
> +numberWithFloat: 25.1 and +numberWithDouble: 25.1 are not equal.  I've
> attached an patch for gtest on this issue which also updates some other
> changes in the general configuration.

This is expected. 25.1 can not be represented exactly as a floating
point number. When you create a float 25.1, you get the float-number
closest to 25.1, and when you create a double 25.1, you get the
double-number closest to 25.1. These usually aren't the same, so the
comparison is correct.

(In practice, you usually don't compare floating point numbers for exact
equality; instead you use

- Alexander Malmberg

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