Question: Recursion is used in Java to reverse an array.

hectorsalamanca — Tue, 17 Jan 2023 08:37:22 GMT

I'm just getting started with recursion, and while studying this article, I was able to utilise it to construct a basic factorial programme without any difficulty. I'm now attempting to construct a recursive function that writes an array in reverse order, but I'm not sure what I'm doing wrong. What am I overlooking? Thank you very much.

import java.io.*; public class Recursion { public static void main(String[] args) throws IOException{ int myArray[] = {1,2,3,4,5,6,7,8,9,10}; } public static void reverseDisplay(int[] ary, int position){ if(position > 0) System.out.print(ary[position]); reverseDisplay(ary, position - 1); } }

Re: Question: Recursion is used in Java to reverse an array.

JohannesLindner — Tue, 17 Jan 2023 10:03:35 GMT

You're not calling the function in your main
You get an infinite recursive loop, because you keep calling the function even if position < 0

import java.io.*; public class Recursion { public static void main(String[] args) throws IOException{ int myArray[] = {1,2,3,4,5,6,7,8,9,10}; reverseDisplay(myArray, 9); } public static void reverseDisplay(int[] ary, int position){ if(position > 0) { System.out.print(ary[position]); reverseDisplay(ary, position - 1); } } }

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Question: Recursion is used in Java to reverse an array.

Re: Question: Recursion is used in Java to reverse an array.