Preprocessor

Question 1

What happens when we compile a piece of C code?

Answer 1

A temp file is generated, this is to perform textual transformations on the code.

This file is then used to create the executable program.

Question 2

What is the purpose of the temp file, when compiling C programs?

Answer 2

It includes headers to access code defined in other source files

It expands macros

Conditionally enable/disable bits of code

Question 3

What should header files contain?

Answer 3

Declarations ONLY

NO Definitions

Question 4

What are Macros?

Answer 4

These are Textual Substitutions

They are useful for defining compile time constants

Question 5

How would I compile a program consisting of multiple source files?

Answer 5

For each source (.c) file, create a header file that exposes the interface of the module

Create an object file for each source file

Link the object files to create the executable

Question 6

What key word can I use to make sure a function/variable is only used in the file it is declared in?

Answer 6

The static keyword