Print the given string in reverse order in C++

Understanding String Reversal

Reversing a string means changing its character order from end to start.

We will explore three different methods to reverse a string in C++.

Method 1: Using a Loop

This method iterates through the string from end to start and prints the characters.

#include <iostream>
#include <algorithm>
using namespace std;

void reverseString(string s) {
    for (int i = s.length() - 1; i >= 0; i--) {
        cout << s[i];
    }
    cout << endl;
}

int main() {
    string str = "hello";
    reverseString(str);
    return 0;
}
            

Method 2: Using Recursion

This method reverses the string using recursion.

#include <iostream>
 
using namespace std;

void reverseRecursively(string s, int index) {
    if (index < 0) {
        cout << endl;
        return;
    }
    cout << s[index];
    reverseRecursively(s, index - 1);
}

int main() {
    string str = "world";
    reverseRecursively(str, str.length() - 1);
    return 0;
}
            

Method 3: Using Reverse Function

This method uses the built-in reverse function to reverse the string.

#include <iostream>
#include <algorithm>
using namespace std;

int main() {
    string s = "example";
    reverse(s.begin(), s.end());
    cout << s << endl;
    return 0;
}