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  1.  
  2. public class Main {
  3.     public static int hitungNomorBit (int angka, int nomorBit)
  4.     {
  5.         int temp = angka;
  6.         int panjang = 0;
  7.  
  8.         if (temp ==0) {
  9.             panjang = 1;
  10.         }else {
  11.             while (temp > 0 ) { 
  12.                 temp = temp / 2;
  13.                 panjang++;
  14.             }
  15.         }
  16.         if (nomorBit < 0 || nomorBit >= panjang) { 
  17.             return -1;
  18.         }
  19.         int[] bit = new int[panjang];
  20.         temp = angka;
  21.         for ( int i = panjang -1; i >=0; i--){
  22.             bit[i] = temp % 2;
  23.             temp = temp / 2;
  24.         }
  25.         if (bit[nomorBit] == 0 ) { 
  26.             return -1;
  27.         }
  28.         int hasil = 0;
  29.         for (int i = 0; i<= nomorBit; i++ ) { 
  30.             hasil = hasil * 2 + bit[i];
  31.         }
  32.         return hasil;
  33.     }
  34.     public static void main(String[] args) {
  35.         int hasil1=hitungNomorBit (13, 0);
  36.         int hasil2=hitungNomorBit (13, 1);
  37.         int hasil3=hitungNomorBit (13, 2);
  38.         System.out.println(hasil1 == -1 ? "null" : hasil1);
  39.         System.out.println(hasil2 == -1 ? "null" : hasil2);
  40.         System.out.println(hasil3 == -1 ? "null" : hasil3);
  41.         ;
  42.     }
  43. }
Success #stdin #stdout 0.07s 54496KB
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https://ideone.com/Buirf0
language:
Java (HotSpot 12)
created:
1 day ago
visibility:
public

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