java program to input a number and check whether it is a magic number or no

Programming Example

Write a program to input a number and check whether it is a magic number or not. If you iterate the process of summing the squares of the decimal digits of the number, and if this process terminates in 1, then the original number is called a magic number. For example 55=> (5+5)=10=>(1 +0)=1.

Solution

import java.util.*;
class MagicNumber
{
	public static void main(String arr[])
	{
		Scanner sc=new Scanner(System.in);
		int n,i,s,d;
		System.out.println(“Enter a number:”);
		n=sc.nextInt();
		for(s=0;n>9;n=s,s=0)
		{
			for(i=n;i>0;i=i/10)
			{
				d=i%10;
				s+=d;
			}
		}
		if(n==1)
			System.out.println(“Magic Number”);
		else
			System.out.println(“Not a magic number”);
	}
}
Output

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