Are unspecified and undefined behavior required to be consistent between compiles of the same program with the same compiler in the same environment?

Question

Let\'s pretend my program contains a specific construct the C++ Standard states to be unspecified behavior. This basically means the implementation has to do something reasonabl

Answer 1

That's the purpose of specifying it as undefined...it means there is no telling what will happen, either on different or even the same platform (with repeated tests).