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Java program to check whether all bits of the number are UNSET (LOW)

Given/input an integer number, we have to check whether all bits of the number are UNSET (LOW).
Submitted by Nidhi, on March 06, 2022

Problem statement

In this program, we will read a number from the user and check all bits of input number are UNSET/LOW.

Java program to check whether all bits of the number are UNSET (LOW)

The source code to check whether all bits of the number are UNSET/LOW is given below. The given program is compiled and executed successfully.

// Java program to check whether all bits 
// of the number are UNSET/LOW

import java.util.Scanner;

public class Main {
  static boolean isAllBitsUnset(byte num) {
    int loop, cnt = 0;

    for (loop = 7; loop >= 0; loop--) {
      //check, if there is any SET/HIGH bit
      if ((num & (1 << loop)) != 0) {
        cnt = 1;
        break;
      }
    }
    if (cnt == 0)
      return true;
    else
      return false;
  }

  public static void main(String[] args) {
    Scanner SC = new Scanner(System.in);
    byte number;

    System.out.printf("Enter an integer number (between 0-255): ");
    number = SC.nextByte();

    if (isAllBitsUnset(number))
      System.out.printf("All bits are UNSET/LOW.\n");
    else
      System.out.printf("All bits are not UNSET/LOW.\n");
  }
}

Output

Enter an integer number (between 0-255): 4
All bits are not UNSET/LOW.

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 contain two static methods isAllBitsUnset() and main().

The isAllBitsUnset() method is used to check all bits of a specified number are LOW or not and return a Boolean value to the calling method.

The main() method is an entry point for the program. Here, we read a number from the user using Scanner class and called isAllBitsUnset() method to check all bits of an input number is LOW or not and printed appropriate message.

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