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Java Exercises: Check whether a 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:

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

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:

Flowchart: Java exercises: Check whether a given integer is a power of 4 or not

Java Code Editor:

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Java: Tips of the Day

getEnumMap

Converts to enum to Map where key is the name and value is Enum itself. 

public static <E extends Enum<E>> Map<String, E> getEnumMap(final Class<E> enumClass) {
    return Arrays.stream(enumClass.getEnumConstants())
            .collect(Collectors.toMap(Enum::name, Function.identity()));
}

Ref: https://bit.ly/3xXcFZt