c++ - What does throw do when not in used with try and catch? -

what throw when not used try , catch? like:

 if (isempty()) throw "stack empty, cannot delete"; 

does printed in console?

but when throw contains int or char arguments, thrown catch; happens in case?

the c++ runtime have along lines of (this not how looks, can think of working way, unless working on special):

void beforemain() {      try      {         int res = main();         exit(res);      }       catch(...)      {          cout << "unhandled exception. terminating..." << endl;          terminate();      } }