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Possible Duplicate:
PHP Math Precision
The following php code outputs 7 but I expect 8. Why the difference?
<?php echo (int)((0.1+0.7)*10); ?>
Because due to inaccurate floating point representations, 0.1+0.7 is not exactly equal to 0.8. It might be some very tiny bit less than that. And when you use
int(..), it truncates it to 7.