Transcription: It's easy to forget to put X-turn C in a C prototype. Unfortunately, if you forget it, you'll probably get an error message that will seem misleading. Suppose you have a C function named compress, and you forget to put X-turn C in its prototype. You won't get any compiler errors, but you'll probably get a message from your linker saying that the compress function is missing. That's because it's looking for a C++ version of compress, and all it's finding is a C version, which of course you didn't use.
(.mp3)