Hacker News new | ask | show | jobs
by aidenn0 39 days ago
That may be how you want C to be specified, but that's not how C is specified. The compiler is always allowed to assume that the input program is free of undefined behaviors.

C++ has an even more trivial example: To be a valid C++ program, all loops without side-effects must terminate. Thus determining if some C++ programs are valid would require solving the halting problem.