What is the essence of the problem?

Question

C++ / C#

I saw this example in one of the books:
const string exclam = "!";
const string message = "hello" + " , world" + exclam;
There was a suggestion to try to determine if the program would work or not, but there were no further comments. I understand that the problem is with the quote before the "world", but what is the essence of the problem is not clear.

Answer 1

Try to compile and see what the problem is, "hello" is not a string, but a const char[]. To make it work, you can, for example, do this:
Now hello - std::string for which operator + is overloaded