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  1. <?php
  2. function hitungNomorBit(int $angka, int $nomorBit): ?int
  3. {
  4.  
  5.     if ($nomorBit !== 0 && $nomorBit !== 1) {
  6.  
  7.         return null;
  8.     }
  9.     if ($angka < 0) {
  10.         return 0;
  11.     }
  12.  
  13.  
  14.     if ($angka === 0) {
  15.         return ($nomorBit === 0) ? 1 : 0;
  16.     }
  17.  
  18.     $hitungan = 0;
  19.     $tempAngka = $angka;
  20.     while ($tempAngka > 0) {
  21.         $bit = $tempAngka % 2;
  22.  
  23.         if ($bit === $nomorBit) {
  24.             $hitungan++;
  25.         }
  26.         $tempAngka = intdiv($tempAngka, 2);
  27.     }
  28.  
  29.     return $hitungan;
  30. }
  31.  
  32. echo "(13, 0) " . (hitungNomorBit(13, 0) ?? "null"). "<br>";
  33. echo "(13, 1) " . (hitungNomorBit(13, 1) ?? "null"). "<br>";
  34. echo "(13, 2) " . (hitungNomorBit(13, 2) ?? "null"). "<br>";
  35. echo "(0, 0) " . (hitungNomorBit(0, 0) ?? "null"). "<br>";
  36. echo "(0, 1) " . (hitungNomorBit(0, 1) ?? "null"). "<br>";
Success #stdin #stdout 0.04s 25416KB
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Standard input is empty
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(13, 0) 1<br>(13, 1) 3<br>(13, 2) null<br>(0, 0) 1<br>(0, 1) 0<br>
https://ideone.com/3O6gif
language:
PHP (php 7.3.5)
created:
5 days ago
visibility:
public

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