Question

Please write a java program that takes a large, user-entered number (usually 10 digits) and tallies the 10 digits to be used in an array. Then, the method should tell the user how many of each number was input.

For example, for the number 445903218, the program should say "2 4's, 1 5...," etc etc.

Answer 1

JAVA CODE:

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        int[] count = new int[10];

        int idx;

        System.out.print("Enter a large number: ");

        String number = scan.next(); // Read a number

        for (int i = 0; i < number.length(); i++) {

            idx = number.charAt(i) - '0'; // Get index whose count has to be incremented

            count[idx]++;

        }

        boolean isFirst = true;

        // Display count of each digit

        for (int i = 0; i < 10; i++) {

            if (count[i] == 1) { // If count is 1 then don't print 's at the end

                if (isFirst) { // Don't print comma if it is printed for the first time

                    System.out.print(count[i] + " " + i);

                    isFirst = false;

                } else

                    System.out.print(", " + count[i] + " " + i);

            } else if (count[i] > 1) {

                if (isFirst) { // Don't print comma if it is printed for the first time

                    System.out.print(count[i] + " " + i + "'s");

                    isFirst = false;

                } else

                    System.out.print(", " + count[i] + " " + i + "'s");

            }

        }

        scan.close();

    }

}

OUTPUT:

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