Print reverse of a string using recursion
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 stringdef reverse(string): if len(string) == 0: return temp = string[0] reverse(string[1:]) print(temp, end='') # Driver program to test above functionstring = "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 recursionusing 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 stringfunction 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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