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How to Match a Pattern in a String in C++?

How to Reverse a String in Place in C++?

Last Updated : 13 Feb, 2024

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In C++, reversing a string is a basic operation in programming that is required in various applications, from simple and complex algorithms. Reversing a string in place involves changing the characters of the string directly without using input-dependent additional storage. In this article, we learn how to reverse a string in place in C++.

For Example,

Input:  myString = "Hello, World!"    Output:  myString = "!dlroW ,olleH"

Reverse a String In-Place in C++

The std::reverse() function provided by the C++ STL library can be used to reverse the string in place. This function takes the iterator to the beginning and the end of the string.

Syntax of std::reverse()

std::reverse(begin, end)

The begin and end can be either an iterator or a pointer.

C++ Program to Reverse a String In-Place

C++

// C++ program to reverse a string in place #include <algorithm> #include <iostream> #include <string>  using namespace std;  int main() {     // Initialize the string     string str = "Hello, World!";      // Reverse the string     reverse(str.begin(), str.end());      // Output the result     cout << "Reversed string is: " << str << endl;      return 0; }

Output

Reversed string is: !dlroW ,olleH

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

Note: In an in-place algorithm, additional space can be used as long as it is not dependent on the input.

How to Match a Pattern in a String in C++?

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C++ Programs
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