Chapter 5
Functions
Related Sections:Roberts,Chapter 5,P137
Today we start our study of functions in C. This is one of the most crucial parts of the language—something you will use in every program that you write. Even if you don’t define any new functions by yourself, main() is a function that has to be present in any complete C program.
Objectives
To understand the concept of calling a function and the reason for supplying arguments as part of the call.
To understand function prototypes and how to write them.
To be able to implement simple functions containing statements used in the previous chapters.
To be able to use the return statements to specify the result of a function
To understand the concept of a predicate functions and how to use them effectively.
To understand  the relationship between formal parameters in a function and arguments in its caller.
Definition
A function is a set of statements that have been collected together and given a name.
A  function body is always a block and therefore consists of statement enclosed in curly braces.
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Functions
Functions from mathematics Functions from C libraries Writing your own functions

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