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Reverse middle words of a string

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  • Difficulty Level : Medium
  • Last Updated : 12 Sep, 2022
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Given a string str, print reverse all words except the first and last words.

Examples: 

Input  : Hi how are you geeks 
Output  : Hi woh era uoy geeks

Input : I am fine
Output : I ma fine
  1. Print the first word.
  2. For remaining middle words, print the reverse of every word after reaching end of it. This will print reverse of all words except the last word.
  3. Print the last word.

Implementation:

C++




// CPP program to print reverse of all words
// except the corner words.
#include <bits/stdc++.h>
using namespace std;
 
void printReverse(string str)
{
    // Print first word
    int i = 0;
    for (i = 0; i < str.length() && str[i] != ' '; i++)
        cout << str[i];
 
    // Print middle words
    string word = "";
    for (; i < str.length(); i++) {
 
        if (str[i] != ' ')
            word += str[i];
        else {
            reverse(word.begin(), word.end());
            cout << word << " ";
            word = "";
        }
    }
 
    // Print last word
    cout << word << " ";
}
 
int main()
{
    string str = "Hi how are you geeks";
    printReverse(str);
    return 0;
}

Java




// Java program to print reverse of all words
// except the corner words.
 
public class GFG{
 
static void printReverse(String str)
    {
        // Print first word
        int i = 0;
        for (i = 0; i < str.length() && str.charAt(i) != ' '; i++)
            System.out.print(str.charAt(i)) ;
     
        // Print middle words
        String word = "";
         
         
        for (; i < str.length(); i++) {
     
            if (str.charAt(i) != ' ')
                word += str.charAt(i);
                 
            else {
                    System.out.print(new StringBuilder(word).
                                reverse().toString() + " ");
                    word = "";
            }
        }
     
        // Print last word
        System.out.print(word + " ");
    }
     
    public static void main(String []args)
    {
        String str = "Hi how are you geeks";
        printReverse(str);
    }
 
// This code is contributed by Ryuga
}

Python3




# Python3 program to print reverse of all words
# except the corner words.
def printReverse(s):
 
    #Taking all the words in a list
    l = [s for s in s.split(' ')]
 
    #printing the first word as it is
    print(l[0], end = ' ')
 
     
    for i in range(1, len(l)-1):
 
        #printing middle words reversed
        print(l[i][::-1], end = ' ')
 
    #printing the last word as it is
    print(l[len(l)-1])
 
s = "Hi how are you geeks"
printReverse(s)

C#




// C# program to print reverse of all words
// except the corner words.
using System;
using System.Text;
 
class GFG
{
 
    static void printReverse(String str)
    {
        // Print first word
        int i = 0;
        for (i = 0; i < str.Length && str[i] != ' '; i++)
            Console.Write(str[i]) ;
     
        // Print middle words
        String word = "";
         
         
        for (; i < str.Length; i++)
        {
     
            if (str[i] != ' ')
                word += str[i];
                 
            else
            {
                word = reverse(word);
                    Console.Write(new StringBuilder(word).ToString() + " ");
                    word = "";
            }
        }
     
        // Print last word
        Console.Write(word + " ");
    }
    static String reverse(String input)
    {
        char[] temparray = input.ToCharArray();
        int left, right = 0;
        right = temparray.Length - 1;
 
        for (left = 0; left < right; left++, right--)
        {
            // Swap values of left and right
            char temp = temparray[left];
            temparray[left] = temparray[right];
            temparray[right] = temp;
        }
        return String.Join("",temparray);
    }
     
    // Driver code
    public static void Main(String []args)
    {
        String str = "Hi how are you geeks";
        printReverse(str);
    }
}
 
// This code contributed by Rajput-Ji

PHP




<?php
// PHP program to print reverse of all
// words except the corner words.
function printReverse($str)
{
    // Print first word
    $i = 0;
    for ($i = 0; $i < strlen($str) &&
                 $str[$i] != ' '; $i++)
        echo $str[$i];
 
    // Print middle words
    $word = "";
    for (; $i < strlen($str); $i++)
    {
 
        if ($str[$i] != ' ')
            $word = $word.$str[$i];
        else
        {
            $word = strrev($word);
            echo $word . " ";
            $word = "";
        }
    }
 
    // Print last word
    echo $word . " ";
}
 
// Driver Code
$str = "Hi how are you geeks";
printReverse($str);
 
// This code is contributed
// by ChitraNayal
?>

Javascript




<script>
 
// JavaScript program to print reverse of
// all words except the corner words.
function printReverse(str)
{
     
    // Print first word
    var i = 0;
    for(i = 0;
        i < str.length && str[i] != " ";
        i++)
        document.write(str[i]);
     
    // Print middle words
    var word = "";
    for(; i < str.length; i++)
    {
        if (str[i] != " ")
            word += str[i];
        else
        {
            var temp = word.split("").reverse().join("");
            document.write(temp + " ");
            word = "";
        }
    }
     
    // Print last word
    document.write(word + " ");
}
 
// Driver code
var str = "Hi how are you geeks";
printReverse(str);
 
// This code is contributed by rdtank
 
</script>

Output

Hi woh era uoy geeks 

Complexity Analysis:

  • Time Complexity: O(n) 
  • Auxiliary Space: O(L) where L is the length of the longest word in the string.

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