精度がよさそう。今度からこれを使おう。
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<?php function p($a = "") { echo $a . PHP_EOL; } function generateArray($size = 20) { $a = [ ]; for($i = 0; $i < $size; $i ++) { $a [] = 0; } return $a; } function probabilityOf($d) { $random100 = lcg_value () * 100; return ($random100 < $d); } function main() { $times = 10000000; $cnt = 0; $percent = 34.56; for($i = 0; $i < $times; $i ++) { if (probabilityOf ( $percent )) { $cnt ++; } } $proportion = $cnt * 100.0 / $times; p ( "cnt : " . $cnt ); p ( "proportion : " . $proportion ); } main (); |
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cnt : 3456685 proportion : 34.56685 |
