What is a string concatenation and ho do you make it work in C++? code example

Example 1: concatenation cpp int and stirng

// with C++11
string result = name + std::to_string(age);

Example 2: c++ string concatenation

string first_name = "foo"
string last_name = "bar"
std::cout << first_name + " " + last_name << std::endl;