All preprocessor directives, variables, named constants, and functions, except main(), must be either declared or defined before they can be used.

Question

Quizplus · Accepted Answer

In C and C++ programming languages, preprocessor directives (like #include and #define), variables, named constants, and functions must be declared or defined before they are used in the code. This is because the compiler processes the code sequentially from top to bottom, so it must be aware of these elements before they are utilized. The exception is the `main()` function, which is the entry point of a program and does not need to be declared before use.

All Preprocessor Directives, Variables, Named Constants, and Functions, Except Main()