Functions and Compiler

Summary

• If header inclusion is missing in calling program, then the C compiler gives a warning and takes default argument types (long or double) and return type (int).

• If header file is included and there is a mismatch between arguments or return type, the C compiler only gives warnings.

• You don't see the warnings, unless you ask for them (see man pages for their flag).

• gcc gives excellent warnings with the -Wall flag.