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  1. <?php
  2.  
  3. function hitungNomorBit($angka, $nomorBit) {
  4.     if ($nomorBit !== 0 && $nomorBit !== 1) {
  5.         return null;
  6.     }
  7.  
  8.     $biner = [];
  9.     while ($angka > 0) {
  10.         $sisa = $angka % 2;
  11.         array_unshift($biner, $sisa);
  12.         $angka = intdiv($angka, 2);
  13.     }
  14.  
  15.     $jumlah = 0;
  16.     foreach ($biner as $bit) {
  17.         if ($bit === $nomorBit) {
  18.             $jumlah++;
  19.         }
  20.     }
  21.  
  22.     return $jumlah > 0 ? $jumlah : null;
  23. }
  24.  
  25. echo "hitungNomorBit(13, 0) = " . var_export(hitungNomorBit(13, 0), true) . PHP_EOL;
  26. echo "hitungNomorBit(13, 1) = " . var_export(hitungNomorBit(13, 1), true) . PHP_EOL;
  27. echo "hitungNomorBit(13, 2) = " . var_export(hitungNomorBit(13, 2), true) . PHP_EOL;
  28.  
  29. ?>
  30.  
Success #stdin #stdout 0.02s 26228KB
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hitungNomorBit(13, 0) = 1
hitungNomorBit(13, 1) = 3
hitungNomorBit(13, 2) = NULL
https://ideone.com/O7KDBv
language:
PHP (php 7.3.5)
created:
9 days ago
visibility:
public

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