pierozanetti wrote: > Hi, > I have a question. This statement is accepted by the g++ compiler (v. 4.1.2, > under linux): > > char c = 'a'; > string s = s + c; > > But the variable s is used before begin defined! Why? It's correct? No, it is not correct. > The program aborts when the statement is reached. > If we change the above code into: > > string s = s + 'a'; > > the error changes. A segmentation fault is raised. > Can anyone tell me why the code is accepted? There is an unbounded number of incorrect C++ programs. We warn about a subset of them. Detecting every incorrect C++ program is, I'm sure an uncomputable problem. Andrew.
