Hello im kinda of new to java and i am stuck on a program. I want to take a word as input and display it in reverse.

ex - hello to olleh

I tried to do the For loop but i am kinda of stuck. Can anyone please help me! thanks!

do a While loop, where you say, while the word is not olleh, do... then you make a loop in which you rearrange the letters one by one, starting from the last one.

isn't a for loop easier? how do i make it to be the reverse of the user input?

import java.util.Scanner;


public class Backwardsword
{

public static void main(String[] args)
{
String word="";
int j;
char[] chr;


System.out.println("Enter a Word:");
Scanner keyboard = new Scanner(System.in);
word= keyboard.nextLine();

chr= word.toCharArray();


for (j=word.length()-1; j>=0; j--)

System.out.println("The word in reverse is " + (chr[j]) + ".");
}
}

I ran my program but the output is

the word in reverse is o.
the word in reverse is l.
the word in reverse is l.
the word in reverse is e.
the word in reverse is h.

well what you got is the word in reverse. is your question why the output is 5 different lines instead of one line saying olleh? if so, look at your System.out.println and you should see it. otherwise, i'm not sure what your question is, because you got the expected output.

I want the user to input a word, example happy
and i want the program to output on the screen, yppah

your problem is in the last for loop, because you are telling the program to output it character by character by putting the system.out.println each time. you need one system.out.println which will output the entire word

Either use a loop like others are saying or you can take the lazy way out:


A StringBuilder contains a reverse method. Then you reverse it and convert the StringBuilder back to a string with the toString() method.

i slightly modified my program and came out with this

import java.util.Scanner;
public class Backwardsword
{
public static void main(String[] args)
{
String word="";
System.out.println("Enter a Word:");
Scanner keyboard = new Scanner(System.in);
word= keyboard.next();

for (int j=word.length(); j >=0; j--)
{
System.out.println(word.substring(j-1, j));
}
}
}

I have one error. i run the program and it says index out of range.i dunno what do do! help!

Whatsup,

I'm sure at this point you know how to read the input from the keyboard.

Here's the reversal code. Later.

-- LiveWire

@curtissumpter: what do you think you are doing giving people ready made code, this forum boasts an attitude opposite of that. Tell the OP the logic mentioning the way to go about, or at the most the psuedocode, but not written code in any manner.

@peedi : Use a stack to reverse the word and I am sure it will be the most convenient approach. Just keep pushing all the letters till the end of the word and then pop them back one by one.