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run code in 300+ PHP versions simultaneously
<?php ini_set('precision', 8); $c = 0; for($a=0;$a<999999.99;$a+=0.01) { for($b=0;$b<999999.99;$b+=0.01) { // mind I don't need to test comparision (round($a-$b,2) == ($a-$b)) echo ($a + $b).','.($a - $b)." vs "; echo round($a + $b,2).','.round($a - $b,2)."<br/>"; if($c++ > 4000) die; } } ?>

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37.22 ms | 402 KiB | 5 Q