C++ Program to Reverse a String

Here you will get C++ program to reverse a string. We will learn two ways to do this, using user-defined and inbuilt functions.

The user is asked to enter a string and then the reverse of the string is displayed.

For example:

• Input String: hello
• Output String: olleh

User Defined Function

In this method, we will use a loop to reverse the string.

#include <iostream>
#include <string>

using namespace std;

int main() {
    string str;
    char temp;
    cout<<"Enter any string:";
    getline (cin, str);
    
    int len = str.length();
    
    for (int i = 0; i < len / 2; i++) {
        temp = str[i];
        str[i] = str[len - i - 1];
        str[len - i - 1] = temp;
    }
    cout << str << endl;
    return 0;
}

Output:

Enter any string:i love c++
++c evol i

Inbuilt Function

This method uses the inbuilt function reverse() from the algorithm header file.

#include <iostream>
#include <string>
#include <algorithm>

using namespace std;

int main() {
    string str;
    
    cout<<"Enter any string:";
    getline (cin, str);
    
    reverse(str.begin(), str.end());
    cout << str << endl;
    
    return 0;
}

Output:

Enter any string:The Crazy Programmer
remmargorP yzarC ehT

Comment below if you are facing any difficulty understanding the above program.