string to int in c++

Certainly! To convert a string to an integer in C++, you can use the std::stoi function. Here's an example with explanations for each step:

#include <iostream>
#include <string>

int main() {
    std::string str = "12345"; // Define a string containing the number "12345"

    int convertedInt = std::stoi(str); // Convert the string to an integer using std::stoi

    std::cout << "String: " << str << std::endl; // Output the original string
    std::cout << "Converted Integer: " << convertedInt << std::endl; // Output the converted integer

    return 0;
}

1. #include <iostream> and #include <string>: Include necessary libraries for input/output and string manipulation.
2. std::string str = "12345";: Define a string variable str containing the characters "12345".
3. int convertedInt = std::stoi(str);: Use std::stoi to convert the string str to an integer and store it in the variable convertedInt.
4. std::cout << "String: " << str << std::endl;: Output the original string str.
5. std::cout << "Converted Integer: " << convertedInt << std::endl;: Output the converted integer convertedInt.
6. return 0;: End the program execution.

This code snippet demonstrates how to convert a string representing a number to an integer using std::stoi in C++.