Home » Java Programs » Java Basic Programs

Java program to reverse bits of the given number

Given/input an integer number, we have to reverse bits of the given number.
Submitted by Nidhi, on March 06, 2022

Problem statement

In this program, we will read an integer number and reverse the bits of the given number using bitwise operators.

Source Code

The source code to reverse bits of the given number is given below. The given program is compiled and executed successfully.

// Java program to reverse bits of 
// the given number

import java.util.Scanner;

public class Main {
  static int reverseBits(short data) {
    int revNum = 0;
    int i = 0;
    int temp = 0;

    for (i = 0; i < 16; i++) {
      temp = (data & (1 << i));
      if (temp != 0)
        revNum |= (1 << ((16 - 1) - i));
    }
    return revNum;
  }

  public static void main(String[] args) {
    short num = 0x4;
    System.out.printf("Number after reversing bits: %d", reverseBits(num));
  }
}

Output

Number after reversing bits: 8192

Explanation

In the above program, we imported the "java.util.Scanner" package to read input from the user. And, created a public class Main. It contains a static method main().

The main() method is an entry point for the program. Here, we created a variable num initialized with 0x4. Then we reversed the bites of number and printed the result.

Java Basic Programs »

---