string reverse

Certainly! Here is an example of reversing a string in C++ along with explanations for each step:

#include <iostream>
#include <string>

using namespace std;

int main() {
    string str = "Hello, World!"; // Define a string variable with the content "Hello, World!"
    int length = str.length(); // Get the length of the string

    for (int i = 0; i < length / 2; i++) { // Loop through the first half of the string
        char temp = str[i]; // Store the character at position i in a temporary variable
        str[i] = str[length - i - 1]; // Replace character at position i with its corresponding character from the end of the string
        str[length - i - 1] = temp; // Replace character at the end of the string with the character stored in the temporary variable
    }

    cout << "Reversed string: " << str << endl; // Output the reversed string
    return 0;
}

Explanation:

• #include <iostream> and #include <string>: Include necessary header files for input/output and string manipulation.
• using namespace std;: Using the standard namespace to avoid prefixing standard functions and objects.
• string str = "Hello, World!";: Define a string variable str and initialize it with the content "Hello, World!".
• int length = str.length();: Determine the length of the string using the length() function of the string class.
• for (int i = 0; i < length / 2; i++) { ... }: Iterate through the first half of the string.
• char temp = str[i];: Store the character at position i in a temporary variable temp.
• str[i] = str[length - i - 1];: Swap the character at position i with its corresponding character from the end of the string.
• str[length - i - 1] = temp;: Replace the character at the end of the string with the character stored in the temporary variable.
• cout << "Reversed string: " << str << endl;: Output the reversed string using cout.

This code utilizes a for loop to reverse the string by swapping characters from the beginning with their respective counterparts from the end of the string until reaching the midpoint. Finally, it prints the reversed string.