How Can I Display Each Digit of a Four-Digit Integer on a Separate Line in Java?

[J.live]

Write a program that reads four-digit integer as a string , such as 1998 and then displays it, one digit per line, like so:
1
9
9
8


Attempt:
Scanner keyboard2 = new Scanner (System.in);
String integer2= "Input a 4 digit number:";
System.out.println(integer2);

How do I make it read ? How do I go about this using string method ? I am lost. Thanks

 

[schip666!]

huh...never seen the Scanner class before. Here's the first doc page I found:
http://www.cs.utexas.edu/users/ndale/Scanner.html

Looks like you can call Scanner.next() to get a string from stdin.

Then you could use String.charAt( x ) to get each character for printing. See here:
http://download.oracle.com/javase/1.4.2/docs/api/java/lang/String.html

For extra credit I guess you could do error checking and stuff to make sure you always get a four digit number as input.

 

[J.live]

How do I implement digits into the split characters ?

Like I type in any four digit number and prints it in a vertical fashion.

Never mind , I got it.

 

[Mark44]

Your integer2 variable is a string instance, which is essentially an array of type char. You can use the charAt method on the string class to get the character at the specified index.

For instance, if integer2 contains the characters '2', '0', '1', and '1', the expression integer2.charAt(2) evaluates to the character value '1'.

You can use a loop to peel off each character in your integer2 variable.

 

[LudusRex]

To read the input from the user, you can use the Scanner class in Java. This class has a method called nextLine() which reads a line of input from the user. You can then use the String class to manipulate the input and display it one digit per line. Here is an example code:

import java.util.Scanner;

public class Main {
public static void main(String[] args) {
Scanner keyboard = new Scanner(System.in);
System.out.println("Input a 4 digit number:");
String input = keyboard.nextLine();
for(int i = 0; i < input.length(); i++) {
System.out.println(input.charAt(i));
}
}
}

In this code, we first create a Scanner object to read the input from the user. Then, we prompt the user to input a 4 digit number and use the nextLine() method to store the input in a String variable called "input". Next, we use a for loop to iterate through each character in the input and use the charAt() method to print each digit on a separate line.

I hope this helps and gives you an idea of how to approach this problem using String methods. Let me know if you have any further questions.