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  1. <?php
  2. function hitungNomorBit(int $angka, int $nomorBit)
  3. {
  4.     if ($nomorBit !== 0 && $nomorBit !== 1) {
  5.         return null;
  6.     }
  7.  
  8.     if ($angka === 0) {
  9.         return $nomorBit === 0 ? 1 : 0;
  10.     }
  11.  
  12.     $jumlah = 0;
  13.  
  14.     while ($angka > 0) {
  15.         $digit = $angka % 2;      
  16.         if ($digit === $nomorBit) {
  17.             ++$jumlah;
  18.         }
  19.         $angka = intdiv($angka, 2);
  20.     }
  21.  
  22.     return $jumlah;
  23. }
  24.  
  25. echo hitungNomorBit(13, 0) . PHP_EOL;   
  26. echo hitungNomorBit(13, 1) . PHP_EOL;  
  27. var_dump(hitungNomorBit(13, 2));
Success #stdin #stdout 0.03s 26088KB
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https://ideone.com/zkVgfm
language:
PHP (php 7.3.5)
created:
20 days ago
visibility:
public

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