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  1. <?php
  2.  
  3. // https://stackoverflow.com/a/1343685/5305370
  4.  
  5. function isqrt($n)
  6. {
  7.   $b = 0;
  8.  
  9.   while($n >= 0)
  10.   {
  11.     $n = $n - $b;
  12.     $b = $b + 1;
  13.     $n = $n - $b;
  14.   }
  15.  
  16.   return $b - 1;
  17. }
  18.  
  19. $a = 9;
  20. $b = isqrt($a);
  21.  
  22. echo "a = ".$a.", sqrt(a) = b = ".$b."\n";
  23. echo "typeof = ".gettype($b)."\n";
Success #stdin #stdout 0s 82560KB
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a = 9, sqrt(a) = b = 3
typeof = integer
https://ideone.com/0CGcDT
language:
PHP (php 7.3.5)
created:
5 years ago
visibility:
public

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