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:

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:
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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.
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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
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