Chapter

Declaration: Prototypes

From ComputerScienceOne by Dr Chris Bourke

Concepts

1. What capabilities and constraints do functions have in C?

   "As a procedural-style language, functions are essential in C programming. As we’ve already seen, C provides a large library of standard functions to perform basic input/output, math, and many other f

2. How are functions defined and declared in modern C?

   "For modern C, defining functions is a two step process. First, you declare a function and its signature using a prototype. Then you define the function by providing a function body that defines what

3. What information does a C function prototype specify?

   "Typically, the documentation for functions is included with the prototype but is not repeated with the function definition. This is a principle known as Don’t Repeat Yourself (DRY). Consider the foll

4. How is a C function prototype turned into a function definition?

   "Later in the program, we can provide the actual definition of each function by using the following syntax. We repeat the signature, but instead of using a semicolon, we provide a code block, enclosed