Re: Comparing floating point values in Java

Philipp wrote:
float a = 1;
float b = 1;

Side note: consider explicitly setting float variables to float constants rather than integer constants:

float a = 1.f;

This prevents conversion from being an issue.

Generally you can count on constants comparing equal if they represent the same value. Generally you cannot count on calculated values equaling differently-calculated values even were they mathematically equivalent given infinite precision.

It makes a difference what values you wish to represent. Not all values are precisely representable in limited-precision floating point.

Read
<http://docs.sun.com/source/806-3568/ncg_goldberg.html>
available as a PDF from
<http://www.physics.ohio-state.edu/~dws/grouplinks/floating_point_math.pdf>
among other places.

- Lew
.

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