how to convert string into integer in cpp code example

Example 1: convert stirng to int c++

int thing = std::stoi(string);

Example 2: c++ string to int

#include <iostream>
#include <string>

int main() {

    std::string str = "123";
    int num;

    // using stoi() to store the value of str1 to x
    num = std::stoi(str);

    std::cout << num;

    return 0;
}