Object-Oriented Programming with Java, part I – Exercise 56

This program asks the user for a word and then the length of the first part to be printed.

My Code

import java.util.Scanner;

public class ReversingText {

    public static String reverse(String text) {
        // write your code here
        // note that method does now print anything, it RETURNS the reversed string
        int i =text.length() -1;
        String revText = "";
        
        while ( i > -1){
            revText = revText + text.charAt(i);
            i--;
        }
        
        
        
        return revText;
    }

    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);
        System.out.print("Type in your text: ");
        String text = reader.nextLine();
        System.out.println("In reverse order: " + reverse(text));
    }
}

Model Code

import java.util.Scanner;

 

public class ReversingText {

 

    public static String reverse(String text) {

        // write your code here

        // note that method does now print anything, it RETURNS the reversed string

        // First we create an empty string

        String result = "";

 

        // then the rest is copied to it one by one at reverse order

        int i = text.length() - 1;

        while (i >= 0) {

            result += text.charAt(i);  // same as result = result + text.charAt(i); 

            i--;

        }

 

        return result;

    }

 

    public static void main(String[] args) {

        Scanner reader = new Scanner(System.in);

        System.out.print("Type in your text: ");

        String text = reader.nextLine();

        System.out.println("In reverse order: " + reverse(text));

    }

}

Comments

Relatively the same although I forgot to use =+ to in the loop to add the characters to the end of revText whereas the Model Code does to add to result.