Can't add strings in C++

Question

#include 


int main()
{
    const std::string exclam = \"!\";
    const std::string message = \"Hello\" + \", world\" + exclam;
    std::cout <&l         


        

Answer 1

"Hello" + ", world"

Since these are c-style strings, you cannot append them with +. You can append a std::string to a c-style string, but not 2 c-style strings this way, instead add a std::string() constructor around one of them to make a temporary, ie:

"Hello" + std::string(", world")