Java: Check whether a number is a Harshad Number or not
Java Numbers: Exercise-12 with Solution
Write a Java program to check whether a number is a Harshad Number or not.
In recreational mathematics, a harshad number in a given number base, is an integer that is divisible by the sum of its digits when written in that base.
Example: Number 200 is a Harshad Number because the sum of digits 2 and 0 and 0 is 2(2+0+0) and 200 is divisible by 2. Number 171 is a Harshad Number because the sum of digits 1 and 7 and 1 is 9(1+7+1) and 171 is divisible by 9.
Test Data
Input a number : 353
Pictorial Presentation:
Sample Solution:
Java Code:
import java.util.Scanner;
public class Example12 {
public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
System.out.print("Input a number : ");
int num = sc.nextInt();
int x = num, y, sum = 0;
while(x>0)
{
y = x%10;
sum = sum + y;
x = x/10;
}
if(num%sum == 0)
System.out.println(num+" is a Harshad Number.");
else
System.out.println(num+" is not a Harshad Number.");
}
}
Sample Output:
Input a number : 353 353 is not a Harshad Number.
Flowchart:

Java Code Editor:
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Java: Tips of the Day
IsPowerOfTwo
Checks if a value is positive power of two.
To understand how it works let's assume we made a call IsPowerOfTwo(4).
As value is greater than 0, so right side of the && operator will be evaluated.
The result of (~value + 1) is equal to value itself. ~100 + 001 => 011 + 001 => 100. This is equal to value.
The result of (value & value) is value. 100 & 100 => 100.
This will value the expression to true as value is equal to value.
public static boolean isPowerOfTwo(final int value) { return value > 0 && ((value & (~value + 1)) == value); }
Ref: https://bit.ly/3sA5d4I
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