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22 lines
440 B
22 lines
440 B
<?php
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use native_types;
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function main()
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{
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ini_set("precision", 17);
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$rounds = (int) file_get_contents("./rounds.txt", true);
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$stop = $rounds + 2;
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var_dump($stop);
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$begin = microtime(true);
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$x = 1.0;
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$pi = 1.0;
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for ($i = 2; $i <= $stop; $i++) {
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$x = -1.0 + 2.0 * ($i & 0x1);
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$pi += $x / (2 * $i - 1);
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}
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$pi *= 4.0;
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print $pi . "\ntime: " . (microtime(true) - $begin) . "\n";
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}
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