C++ String Exercises: Reverse the words in a string that have odd lengths

Last update on April 11 2025 12:47:34 (UTC/GMT +8 hours)

35. Reverse Words with Odd Lengths in a String

Write a C++ program to reverse all words that have odd lengths in a string.

Test Data:
("Exercises Practice Solution" ) -> "sesicrexE Practice Solution"
("The quick brown fox jumps over the lazy dog") -> "ehT kciuq nworb xof spmuj over eht lazy dog."

Sample Solution:

C++ Code:

#include <bits/stdc++.h> // Includes all standard libraries

using namespace std; // Using the standard namespace

// Function to reverse words with odd lengths in the input string 's'
string test(string s) {
    stringstream str(s); // Create a stringstream object 'str' with string 's'
    string temp, result(""); // Declare strings to store temporary values and the final result

    // Loop through the words separated by spaces in the stringstream
    while (getline(str, temp, ' ')) {
        // Check if the length of the word is odd (using bitwise AND operation)
        if ((temp.length() & 1) == 1)
            reverse(temp.begin(), temp.end()); // Reverse the word if its length is odd

        result += temp + " "; // Append the word to the result string with a space
    }

    result.pop_back(); // Remove the extra space at the end
    return result; // Return the modified string
}

int main() {
    // Test cases
    string text = "Exercises Practice Solution";
    cout << "String: " << text;
    cout << "\nReverse the words in the said string that have odd lengths:\n";
    cout << test(text) << endl; // Display the modified string

    text = "The quick brown fox jumps over the lazy dog.";
    cout << "\nString: " << text;
    cout << "\nReverse the words in the said string that have odd lengths:\n";
    cout << test(text) << endl; // Display the modified string
}

Sample Output:

String: Exercises Practice Solution
Reverse the words in the said string that have odd lengths:
sesicrexE Practice Solution

String: The quick brown fox jumps over the lazy dog.
Reverse the words in the said string that have odd lengths:
ehT kciuq nworb xof spmuj over eht lazy dog.

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C++ program to reverse only the words in a sentence that have an odd number of characters.
• Write a C++ program that processes a string and outputs a modified string where every word with an odd length is reversed.
• Write a C++ program to scan a sentence and reverse words of odd length using a loop and string reversal function.
• Write a C++ program that reads a sentence, reverses only odd-length words, and prints the updated sentence while preserving spaces.

C++ Code Editor:

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Previous C++ Exercise: Remove a word from a given string.