Question

WAP to input a number and check the number is karpakar number or not.A karpakar number is a number whose square if splitted in two parts and added the sum is itself the number for example 45^2=2025 and 20+25=45

Answer 1

Answer:

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Check whether a number is Kaprekar number or not.

This program checks whether a number is Kaprekar number or not.

A number is said to be Kaprekar number if its sum of digits in its square is the number itself.

Example- 9^2 is 81 and 8+1 is 9.So it is a Kaprekar number.

import java.util.*;

public class KaprekarNumbers

{

public static void main(String args[])

{

Scanner ob=new Scanner(System.in);

System.out.println("Enter number");

int n=ob.nextInt();

int N=n*n;

int tn=n;int c=0;

while(tn!=0)

{

tn=tn/10;c++;

}

int q=(int)(N/Math.pow(10,c));

int r=(int)(N%Math.pow(10,c));

if(q+r==n)

System.out.println("Kaprekar number");

else

System.out.println("Non Kaprekar number");

}

}