> I am not familar with both c++ and compiler implementation, donot konw > why the results are differnt for gcc and clang. Anyone could help and > explain this difference for me?
The ISO C standard says that the evaluation order of function arguments is unspecified [ISO C99, 6.5.2.2-11], though the implementation (GCC vs. clang) is free to choose which evaluation order to use. That's why you see these differences between GCC and clang. Andi
