Question

Java Code!!!!

A five-digit number is said to be friendly if:

• the leftmost digit is divisible by 1 and
• the leftmost two digits are divisible by 2 and
• the leftmost 3 digits are divisible by 3 and
• the leftmost 4 digits are divisible by 4 and
• leftmost 5 digits (the five-digit number itself) is divisible by 5.

For example, the number 42325 is a friendly number:

• 4 is divisible by 1 and
• 42 is divisible by 2 and
• 423 is divisible by 3 and
• 4232 is divisible by 4 and
• 42325 is divisible by 5.

Write a program that will accept a 5 digit number (i.e, 10000 - 99999) from the user and prints to the screen a message telling the user if the number entered is or is not a friendly number. If the number entered is not a 5 digit number print to the screen an appropriate message and end the program. You must use an if/else statement which must have a condition constructed using boolean logic to test if the number is friendly.

Answer 1

import java.util.Scanner;

public class FriendlyNumber {
   public static void main(String[] args) {
       System.out.println("Enter number: ");
       Scanner sc = new Scanner(System.in);
       int num = sc.nextInt();
       if(num<10000 || num>99999){
           System.out.println("Invalid number");
           return;
       }
       boolean flag = true;
       if (num % 5 != 0) {
           flag = false;
       } else {

//removing last digit by dividing with 10
           num = num / 10;
           if (num % 4 != 0) {
               flag = false;
           } else {

//removing last digit by dividing with 10
               num = num / 10;
               if (num % 3 != 0) {
                   flag = false;
               } else {

//removing last digit by dividing with 10
                   num = num / 10;
                   if (num % 2 != 0) {
                       flag = false;
                   }
               }
           }
       }
       if(flag)
           System.out.println("Friendly Number");
       else
           System.out.println("Not a Friendly Number");
          
   }
}

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