Define a class to accept a four digit number and check whether it is a Framul Number or not. A number is called a Framul Number if the product of all its digits equals fives times the sum of its first and last digit.

Example 1:

Input: 1325
Product of all digits = 1 x 3 x 2 x 5 = 30
Five times sum of first & last digit = 5 x (5 + 1) = 5 x 6 = 30

Output: Framul Number

Example 2:

Input: 2981
Product of all digits = 2 x 9 x 8 x 1 = 144
Five times sum of first & last digit = 5 x (1 + 2) = 5 x 3 = 15

Output: Not a Framul Number

If the entered number is not of four digits, the message "Please enter a four digit number" should be shown.

import java.util.Scanner;

public class KboatFramulNumber
{
    public static void main(String args[]) {
        Scanner sc = _____(1)_____
        
        System.out.print("Enter a four-digit number: ");
        int num = _____(2)_____
        
        _______(3)_______ {
            System.out.println("Please enter a four-digit number");
            return;
        }
        
        int d = 0;
        int f = num % 10;
        int p = 1;
        
        _______(4)_______ {
            _____(5)_____
            _____(6)_____
            _____(7)_____
        }

        int s =  _____(8)_____

        if (p == s) {
            _______(9)_______
        } else {
            _______(10)_______
        }
        
    }
}

1. new Scanner(System.in);
2. sc.nextInt();
3. if (num < 1000 || num > 9999)
4. while (num > 0)
5. d = num % 10;
6. p = p * d;
7. num = num / 10;
8. 5 * (f + d);
9. System.out.println("Framul Number");
10. System.out.println("Not a Framul Number");

Explanation

import java.util.Scanner;

public class KboatFramulNumber
{
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        
        System.out.print("Enter a four-digit number: ");
        int num = sc.nextInt();
        
        if (num < 1000 || num > 9999) {
            System.out.println("Please enter a four-digit number");
            return;
        }
        
        int d = 0;
        int f = num % 10;
        int p = 1;
        
        while (num > 0) {
            d = num % 10;
            p = p * d;
            num = num / 10;
        }

        int s = 5 * (f + d);

        if (p == s) {
            System.out.println("Framul Number");
        } else {
            System.out.println("Not a Framul Number");
        }
        
    }
}

Variable Description Table

Program Explanation

Let's go through the program step-by-step to understand the logic and functionality:

1. Input Handling:

The program begins by prompting the user to enter a four-digit number. It uses Scanner to read an integer input from the user.

2. Validation:

if (num < 1000 || num > 9999) {
    System.out.println("Please enter a four-digit number");
    return;
}

Here, the method checks if the entered number is indeed a four-digit number. If num is less than 1000 or greater than 9999, it prints a message asking for a four-digit number and exits the method.

3. Initialization:

int d = 0;
int f = num % 10;
int p = 1;

• d is initialized to store each digit during the extraction process.
• f is initialized to hold the last digit of the number (num % 10).
• p is initialized to 1 for calculating the product of digits.

4. Digit Extraction and Product Calculation:

while (num > 0) {
    d = num % 10;
    p = p * d;
    num = num / 10;
}

• A while loop iteratively extracts each digit of the number.
• d = num % 10 extracts the current last digit.
• p = p * d updates the running product with the current digit.
• num = num / 10 removes the last digit from the number.

5. Calculate Sum and Comparison:

int s = 5 * (f + d);

• s is calculated as five times the sum of the first (d from the last iteration) and last (f) digit.

6. Determine Framul Number:

if (p == s) {
    System.out.println("Framul Number");
} else {
    System.out.println("Not a Framul Number");
}

• The program compares the product of the digits (p) with s.
• If they are equal, it outputs "Framul Number"; otherwise, "Not a Framul Number".

Output