Hi - I've writing a few tests for the math extension and have a question
about floating point precision.
Here's a small example:
--TEST--
Test return type and value for expected input sin()
--INI--
precision = 14
--FILE--
<?php
$threesixty = pi() * 2.0;
echo "sin 360 = ";
var_dump(sin($threesixty));
?>
--EXPECT--
sin 360 = float(-2.4492127076448E-16)
Is it right to test for an exact number in this way? I was slightly
suprised that I got the same number from Windows and Linux (maybe I
shouldn't be).
If not, I could write the test above to check that sin 360 is zero
plus/minus some small number - but how small?
Zoe Slattery
IBM
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