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  1. <?php
  2.  
  3. function hitungNomorBit(int $angka, int $nomorBit): ?int {
  4.     if ($angka < 0 || $nomorBit < 0) return null;
  5.  
  6.     $biner = [];
  7.     while ($angka > 0) {
  8.         array_unshift($biner, $angka % 2);
  9.         $angka = intdiv($angka, 2);
  10.     }
  11.  
  12.     if ($nomorBit >= count($biner)) {
  13.         return null;
  14.     }
  15.  
  16.     $jumlah = 0;
  17.     for ($i = $nomorBit; $i < count($biner); $i++) {
  18.         if ($biner[$i] === 1) {
  19.             $jumlah++;
  20.         }
  21.     }
  22.  
  23.     return $jumlah;
  24. }
  25.  
  26. echo "hitungNomorBit(13, 0) = " . hitungNomorBit(13, 0) . "\n"; // 1 (bit: 1)
  27. echo "hitungNomorBit(13, 1) = " . hitungNomorBit(13, 1) . "\n"; // 3 (bit: 1, 0, 1)
  28. echo "hitungNomorBit(13, 2) = ";
  29. var_dump(hitungNomorBit(13, 2)); 
  30.  
  31.  
Success #stdin #stdout 0.04s 26340KB
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hitungNomorBit(13, 0) = 3
hitungNomorBit(13, 1) = 2
hitungNomorBit(13, 2) = int(1)
https://ideone.com/FdT7oZ
language:
PHP (php 7.3.5)
created:
9 days ago
visibility:
public

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