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Java program to swap the first and second bits of an integer number

Given/input an integer number, we have to swap its first and second bits.
Submitted by Nidhi, on March 06, 2022

Problem Solution:

In this program, we will read an integer number and swap first and second bits of the input number.

Program/Source Code:

The source code to swap the first and second bits of an integer number is given below. The given program is compiled and executed successfully.

// Java program to swap 1st and 2nd bits
// of an integer number

import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    byte data = 10;

    byte bit_1 = 0;
    byte bit_2 = 0;
    byte xor_of_bit = 0;;

    //Get 1st bit from data
    bit_1 = (byte)((data >> 1) & 1);

    //Get 2nd bit from data
    bit_2 = (byte)((data >> 2) & 1);

    //Now swap bit_1 and bit_2.
    xor_of_bit = (byte)(bit_1 ^ bit_2);
    data = (byte)(data ^ (xor_of_bit << 1 | xor_of_bit << 2));

    System.out.printf("After swapping the bit1 and bit2: %02d", data);
  }
}

Output:

After swapping the bit1 and bit2: 12

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 an integer variable initialized with 10. Then we swapped 1^st and 2^nd bits of number and printed the result.

Binary of 10: 0000 1010
After swapping of bit 1 and 2
Binary will be: 0000 1100
Output number will be: 12

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