Recursion using a String

Question

public static String repeater(int x, String word) {
   if　(x > 0) {
       System.out.print(word.charAt(0));
   }

   if (x == 0) {
       return "";
   } else {
       return repeater(number-1, x);
   }

This code gives me the output I want which is basically taking the first letter of a String and printing it 'x' number of times:

Example:

when my 
String = Hello 
and x = 6

HHHHHH

My problem is I want this method to work the same way but without the use of the 'System.out.print()' line. Am I going to have to add a second String? If not, what approach should I take?

hata · Accepted Answer · 2015-09-23 13:44:01Z

3

Ok, I see you need it's recursive.

public static String repeater(int x, String word) {
    if (x == 0) {
        return "";
    } else {
        return word.charAt(0) + repeater(x - 1, word);
    }
}

How is this?

For understanding this recursion, it is working like nested parentheses of Mathematics.

"H" + ("H" + ("H" + ("H" + ("H" + ("H" + (""))))))

edited Sep 23, 2015 at 13:44

answered Sep 23, 2015 at 9:17

hata

12.6k6 gold badges50 silver badges77 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Xirol Over a year ago

It has to be recursion unfortunately

Xirol Over a year ago

I appreciate you trying to help me though! :)

Xirol Over a year ago

This is exactly what I was wanting to do. Perfect! Thanks hata !!

Xirol Over a year ago

This is out of topic but I just wanted to say that this community is just incredible. You guys are out of this world, keep it up :)

steenbergh · Accepted Answer · 2015-09-23 09:38:32Z

0

Yes, you can add second string. And instead of "System.out.print" you can assign value of word.charAt(0) to that variable.

pseudo code-

String output="";

below line of code within repeater method

output=output+convert.tostring(word.charAt(0))

i.e.:

String output="";
public static void repeater(int x, String word) {
  if　(x > 0) {
    output += convert.toString(word.charAt(0));
 }

 if (x == 0) {
   return;
 } else {
   repeater(number-1, x);
 }
}

edited Sep 23, 2015 at 9:38

steenbergh

1,7913 gold badges24 silver badges43 bronze badges

answered Sep 23, 2015 at 9:09

Rakesh

2281 silver badge6 bronze badges

1 Comment

Xirol Over a year ago

I'm a bit lost as to what you mean. Could you show me instead?

Collectives™ on Stack Overflow

Recursion using a String

2 Answers 2

4 Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

4 Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related