How to Reverse a String in C++?

In C++, strings are the sequence of characters that are used to represent textual data. In this article, we will learn how to reverse a string in C++.

For Example,

Input:
myString = "Hello, GFG!"

Output:
myString = "!GFG ,olleH"

Reverse a string in C++

Reversing a string means the last character should be the first character the second last should be the second and so on. Reversing a string is a basic operation in programming and in C++, we can do that using the std::reverse() algorithm provided in the STL <algorithm> library.

Syntax of std::reverse()

std::reverse(begin_itr, end_itr);

where,

• begin_itr is the iterator to the beginning of the range.
• end_itr is the iterator to the end of the range.

C++ Program to Reverse a String in C++

C++

// C++ program to reverse a string using the reverse()
// function
#include <algorithm>
#include <iostream>

using namespace std;

int main()
{
    string str = "Hello, World!";
    cout << "Original string: " << str << endl;

    // Reverse the string using the reverse() function
    reverse(str.begin(), str.end());

    cout << "Reversed string: " << str << endl;

    return 0;
}

Output

Original string: Hello, World!
Reversed string: !dlroW ,olleH

Time Complexity: O(n)
Auxiliary Space: O(1)