parseInt in c++ code example

Example 1: c++ parse int

std::string s = "10";
int i = std::stoi(s);

Example 2: how to string to integer in c++

#include<string>
string str1 = "45"; 
string str2 = "3.14159"; 
string str3 = "31337 geek";

int myint1 = stoi(str1);
std::cout<<stoi(str1);