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Print reverse of a string using recursion
  • Difficulty Level : Easy
  • Last Updated : 01 May, 2019

Write a recursive function to print reverse of a given string.

Program:

C++




// C++ program to reverse a string using recursion 
#include <bits/stdc++.h>
using namespace std;
  
/* Function to print reverse of the passed string */
void reverse(string str) 
    if(str.size() == 0)
    {
        return;
    }
    reverse(str.substr(1));
    cout << str[0];
  
/* Driver program to test above function */
int main() 
    string a = "Geeks for Geeks"
    reverse(a); 
    return 0; 
  
// This is code is contributed by rathbhupendra

C




// C program to reverse a string using recursion
# include <stdio.h>
  
/* Function to print reverse of the passed string */
void reverse(char *str)
{
   if (*str)
   {
       reverse(str+1);
       printf("%c", *str);
   }
}
  
/* Driver program to test above function */
int main()
{
   char a[] = "Geeks for Geeks";
   reverse(a);
   return 0;
}

Java




// Java program to reverse a string using recursion
  
class StringReverse
{
    /* Function to print reverse of the passed string */
    void reverse(String str)
    {
        if ((str==null)||(str.length() <= 1))
           System.out.println(str);
        else
        {
            System.out.print(str.charAt(str.length()-1));
            reverse(str.substring(0,str.length()-1));
        }
    }
      
    /* Driver program to test above function */
    public static void main(String[] args) 
    {
        String str = "Geeks for Geeks";
        StringReverse obj = new StringReverse();
        obj.reverse(str);
    }    
}

Python




# Python program to reverse a string using recursion
  
# Function to print reverse of the passed string
def reverse(string):
    if len(string) == 0:
        return
      
    temp = string[0]
    reverse(string[1:])
    print(temp, end='')
  
# Driver program to test above function
string = "Geeks for Geeks"
reverse(string)
  
# A single line statement to reverse string in python
# string[::-1]
  
# This code is contributed by Bhavya Jain

C#




// C# program to reverse 
// a string using recursion
using System;
  
class GFG
{
    // Function to print reverse
    // of the passed string
    static void reverse(String str)
    {
        if ((str == null) || (str.Length <= 1))
        Console.Write(str);
      
        else
        {
            Console.Write(str[str.Length-1]);
            reverse(str.Substring(0,(str.Length-1)));
        }
    }
      
    // Driver Code
    public static void Main() 
    {
        String str = "Geeks for Geeks";
        reverse(str);
    
}
  
// This code is contributed by Sam007

PHP




<?php
// PHP program to reverse 
// a string using recursion
  
// Function to print reverse
// of the passed string
function reverse($str)
{
    if (($str == null) || 
        (strlen($str) <= 1))
    echo ($str);
  
    else
    {
        echo ($str[strlen($str) - 1]);
        reverse(substr($str, 0, 
               (strlen($str) - 1)));
    }
}
  
// Driver Code
$str = "Geeks for Geeks";
reverse($str);
  
// This code is contributed by 
// Manish Shaw(manishshaw1)
?>


Output:
skeeG rof skeeG


Explanation:
Recursive function (reverse) takes string pointer (str) as input and calls itself with next location to passed pointer (str+1). Recursion continues this way, when pointer reaches ‘\0’, all functions accumulated in stack print char at passed location (str) and return one by one.

Time Complexity: O(n)

See Reverse a string for other methods to reverse string.

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.




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