Modify the RepeatedDigits program below so that the user can enter more than one

Question

Modify the RepeatedDigits program below so that the user can enter more than one number to be tested for repeated digits. The program should terminate when the user enters a number that's less than or equal to 0. Please give single line comment and explanation next modified lines.

//////////////////////////////////////////////////////////////
// From JAVA PROGRAMMING: FROM THE BEGINNING, by K. N. King //
// Copyright (c) 2000 W. W. Norton & Company, Inc. //
// All rights reserved. //
// This program may be freely distributed for class use, //
// provided that this copyright notice is retained. //
// //
// RepeatedDigits.java (Chapter 5, page 198) //
//////////////////////////////////////////////////////////////

// Checks a number for repeated digits

import jpb.*;

public class RepeatedDigits {
public static void main(String[] args) {
// Prompt user to enter a number and convert to int form
SimpleIO.prompt("Enter a number: ");
String userInput = SimpleIO.readLine().trim();
int number = Integer.parseInt(userInput);

// Create an array to store digit counts
int[] digitCounts = new int[10];

// Remove digits from the number, one by one, and
// increment the corresponding array element
while (number > 0) {
digitCounts[number%10]++;
number /= 10;
}

// Create a string containing all repeated digits
String repeatedDigits = "";
for (int i = 0; i < digitCounts.length; i++)
if (digitCounts[i] > 1)
repeatedDigits += i + " ";

// Display repeated digits. If no digits are repeated,
// display "No repeated digits".
if (repeatedDigits.length() > 0)
System.out.println("Repeated digits: " +
repeatedDigits);
else
System.out.println("No repeated digits");
}
}

Explanation / Answer

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//////////////////////////////////////////////////////////////
// From JAVA PROGRAMMING: FROM THE BEGINNING, by K. N. King //
// Copyright (c) 2000 W. W. Norton & Company, Inc. //
// All rights reserved. //
// This program may be freely distributed for class use, //
// provided that this copyright notice is retained. //
// //
// RepeatedDigits.java (Chapter 5, page 198) //
//////////////////////////////////////////////////////////////

// Checks a number for repeated digits

import jpb.*;

public class RepeatedDigits {
public static void main(String[] args) {
// Prompt user to enter a number and convert to int form
SimpleIO.prompt("Enter a number: ");
String userInput = SimpleIO.readLine().trim();
int number = Integer.parseInt(userInput);
while(number>0)                 //do until sentinel entered
{
// Create an array to store digit counts
int[] digitCounts = new int[10];

// Remove digits from the number, one by one, and
// increment the corresponding array element
while (number > 0) {
digitCounts[number%10]++;
number /= 10;
}

// Create a string containing all repeated digits
String repeatedDigits = "";
for (int i = 0; i < digitCounts.length; i++)
if (digitCounts[i] > 1)
repeatedDigits += i + " ";

// Display repeated digits. If no digits are repeated,
// display "No repeated digits".
if (repeatedDigits.length() > 0)
System.out.println("Repeated digits: " +
repeatedDigits);
else
System.out.println("No repeated digits");

SimpleIO.prompt("Enter a number: ");
userInput = SimpleIO.readLine().trim();               //get next number
number = Integer.parseInt(userInput);


}
}
}

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