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This works:
string z
z="";
z=z+"123"+"4";

but this will not compile: (invalid operands...binary operator)
z= "123" + "4" ;

I found from trial and error I had to start any concatenation assignment with a string variable, otherwise it won't compile.

Can someone help me understand why?

This is because std::string has an operator + overloaded, but not char*
So writing: will return a reference to std::string ( and this why you can add another const char* )

While: is undefined

But these kind of questions should really be posted on stackoverflow.com or any c++ forum, but not here

Eran

But these kind of questions should really be posted on stackoverflow.com or any c++ forum, but not here

Thank you, Appreciate the pointer to c++ help.