Java Program to Check Krishnamurthy Number

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In the previous article, we have discussed Java Program to Check ISBN Number

In this article we are going to understand what Krishnamurthy number is and how we can check whether a number is Krishnamurthy or not in Java with examples.

Program to Check Krishnamurthy Number

Krishnamurthy numbers are numbers whose factorial of individual digits adds up to the number itself.

 Example :

145: 1!+4!+5!= 1+24+120 = 145 Krishnamurthy number
19:   1!+9!=1+362880=362881 Not a Krishnamurthy number
124: 1!+2!+4!= 1+2+24=27 Not a Krishnamurthy number

In the above examples the numbers 19 and 124 are not Krishnamurthy numbers as their factorials don’t add up to the numbers. Hence 145 is the only Krishnamurthy number here.

Let’s see different ways to check Krishnamurthy number

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Approach :

  1. Enter/declare a number and store it.
  2. We calculate the factorials of each digit using a function and add them.
  3. If the resultant sum is the same as the entered number, then the number is said to be a Krishnamurthy number.

Method-1: Java Program to Check Krishnamurthy Number By Using Static Value

import java.util.Scanner;
public class KrishnamurthyNumber{
    public static void main(String args[])
    {
        //A number declared
        int num = 145;

        int temp = num,remainder, sum =0;
        //Loop to iterate through digits and add their factorials
        while(temp>0)
        {
            remainder = temp%10;
            sum+= factorialOf(remainder);
            temp = temp /10;
        }

        if(sum==num)
        {
            System.out.println(num+" is a Krishnamurthy number");
        }
        else
        {
            System.out.println(num+" is not a Krishnamurthy number");
        }
    }

    // Function that returns the factorial of the number
    static int factorialOf(int num)
    {
        int prod = 1;
        while(num>0)
        {
            prod = prod*num;
            num--;
        }
        return prod;
    }
}

Output:

145 is a Krishnamurthy number

Method-2: Java Program to Check Krishnamurthy Number By User Defined Method

import java.util.Scanner;
public class KrishnamurthyNumber{
    public static void main(String args[])
    {
        //Taking the number as input from the user using scanner class
        Scanner scan = new Scanner(System.in);
        System.out.print("Enter a number : ");
        int num = scan.nextInt();

        int temp = num,remainder, sum =0;
        //Loop to iterate through digits and add their factorials
        while(temp>0)
        {
            remainder = temp%10;
            sum+= factorialOf(remainder);
            temp = temp /10;
        }

        if(sum==num)
        {
            System.out.println(num+" is a Krishnamurthy number");
        }
        else
        {
            System.out.println(num+" is not a Krishnamurthy number");
        }
    }

    // Function that returns the factorial of the number
    static int factorialOf(int num)
    {
        int prod = 1;
        while(num>0)
        {
            prod = prod*num;
            num--;
        }
        return prod;
    }
}

Output:

Case-1

Enter a number : 145
145 is a Krishnamurthy number

Case-2

Enter a number : 146
146 is a Krishnamurthy number

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