Java Exercises: Check whether an given integer is a power of 4 or not

Java Basic: Exercise-110 with Solution

Write a Java program to check whether an given integer is a power of 4 or not.

Given num = 64, return true. Given num = 6, return false.

Pictorial Presentation:

Sample Solution:

Java Code:

import java.util.Scanner;
public class Example110 {
     public static void main(String[] arg) 
	 {
	   int test = 0;
	   Scanner in = new Scanner(System.in);	
	   System.out.print("Input a positive integer: ");
	   int n = in.nextInt(); 
       if (n < 1) {
			 System.out.print(Boolean.toString(false));
			 test = 1;
		}
		if ((n & (n - 1)) != 0) {
			System.out.print(Boolean.toString(false));
			test = 1;
		}
		if (test==0)
		{
			System.out.print(Boolean.toString((n & 0x55555555) != 0));      	
		}
		System.out.print("\n");
	}	
}

Sample Output:

Input a positive integer: 64                                           
true

Flowchart:

Java Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a Java program to form a staircase shape of n coins where every k-th row must have exactly k coins.
Next: Write a Java program to add two numbers without using any arithmetic operators.