In mathematics, if the sum of its digits recursively is calculated till a single digit. If the single digit is 1 then the number is called a magic number. It is quite similar to the happy number.
For example, 325 is a magic number because the sum of its digits (3+2+5) is 10, and again sum up the resultant (1+0), we get a single digit (1) as the result. Hence, the number 325 is a magic number.
Code:
import java.util.Scanner;
public class CheckMagicNumber
{
public static void main(String args[])
{
int n, remainder = 1, number, sum = 0;
//creating a constructor of the Scanner class
Scanner sc = new Scanner(System.in);
System.out.print("Enter a number you want to check: ");
//reading an integer form the user
n = sc.nextInt();
//assigning the entered number in the variable num
number = n;
//outer while loop
while (number > 9) //while(number > 0 || sum > 9)
{
//inner while loop
while (number > 0)
{
//determines the remainder
remainder = number % 10;
sum = sum + remainder;
//divides the number by 10 and removes the last digit of the number
number = number / 10;
}
number = sum;
sum = 0;
}
if (number == 1)
{
System.out.println("The given number is a magic number.");
}
else
{
System.out.println("The given number is not a magic number.");
}
}
}
Output:
Tags:
Java Programs
