Question

Using Java, how would you test if a int number contains the digit 8 using recursive functions?

public static boolean isLucky(int number)

Answer 1

Here is the answer for your question in Java Programming Language.

CODE :

import java.util.*; import java.io.*; public class Main {                 public static void main(String[] args) {                        //Prompting user for input                                 System.out.println("Please enter an integer");                                 Scanner s = new Scanner(System.in);                                 int number = s.nextInt();                //Calling isLucky method with the user input as parameter                                 boolean result = isLucky(number);                      //If the method returns true the number contains 8                                 if(result == true)                                 {                                     System.out.println("Lucky number");                                 }                                 else //Else the number doesnot contain 8                                 {                                     System.out.println("Not a Lucky number");                                 }                 }                 //Implementing isLucky() method                 public static boolean isLucky(int number)                 { //Variables to hold user input and each digit to check for 8                     int n = number,rem;                     while(n>0) //Loop iterates through all the digits of the number                     {                         //Returns last digit as remainder                     rem = n%10;                     //Returns the number removing last digit                     n = n/10;                     if(rem!=8) //If the remainder does not contain digit 8                     {                         return isLucky(n); //Recursively calling the same function                     }                     else if(rem == 8)                     {                         return true ; // Else returns true                     }                     }                     return false; //If there is no digit 8 in number returns false                 } }

SCREENSHOTS:

Please see the screenshots of the code below for indentations of the code.

OUTPUT:

Any doubts regarding this can be explained with pleasure:)