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Java Tutorial : Find closest number to a given number without a given digit

Java program to find closest number to a Given number without a given digit :

  1. This program will find closest number to a user given number that should not contain a user input digit.
  2. Result number can be less than or greater than the given number.
  3. e.g. Closest number greater than 123 without containing 3 is 124 and smaller than 123 without containing 3 is 122.
  4. Using Scanner class, we will get the number, digit and greater than/ less than informations from the user.
  5. The digit is scanned as a character.
  6. Using a for loop, we will scan all digits one by one.
  7. To check if the character is in the digit , we are using Integer.toString(no).indexOf(digit). If the digit is not in the number, it will return -1.
  8. Scan one by one and test each number.

Program :

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int no;
        Character digit;
        Character c;

        System.out.println("Enter a number : ");
        no = sc.nextInt();

        System.out.println("Enter the digit  : ");
        digit = sc.next().charAt(0);

        System.out.println("Do you want to look for a number that is larger or smaller than " + no + " ? Please use " +
                "\'g\' for greater than or" +
                "\'l\' for less than ");

        c = sc.next().charAt(0);


        if (c == 'g') {
            System.out.println("Closest number : " + findClosestNumber(no, digit, true));
        } else if (c == 'l') {
            System.out.println("Closest number : " + findClosestNumber(no, digit, false));
        } else {
            System.out.println("Please provide a valid answer !! ");
        }


    }


    static int findClosestNumber(int no, Character digit, boolean greaterThan) {

        if (greaterThan) {
            for (int i = no + 1; i > no; i++) {
                if (isValidNumber(i, digit)) {
                    return i;
                }
            }
        } else {

            for (int i = no - 1; i > 0; i--) {
                if (isValidNumber(i, digit)) {
                    return i;
                }
            }
        }
        return -1;
    }

    static boolean isValidNumber(int no, Character digit) {
        return Integer.toString(no).indexOf(digit) == -1;
    }

}

Examples :

Enter a number :
133
Enter the digit  :
1
Do you want to look for a number that is larger or smaller than 133 ? Please use 'g' for greater than or'l' for less than
l
Closest number : 99

Enter a number :
23567
Enter the digit  :
4
Do you want to look for a number that is larger or smaller than 23567 ? Please use 'g' for greater than or'l' for less than
g
Closest number : 23568

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Published on 9 Sep 2017

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