Book Image

Learn C Programming

By : Jeff Szuhay
Book Image

Learn C Programming

By: Jeff Szuhay

Overview of this book

C is a powerful general-purpose programming language that is excellent for beginners to learn. This book will introduce you to computer programming and software development using C. If you're an experienced developer, this book will help you to become familiar with the C programming language. This C programming book takes you through basic programming concepts and shows you how to implement them in C. Throughout the book, you'll create and run programs that make use of one or more C concepts, such as program structure with functions, data types, and conditional statements. You'll also see how to use looping and iteration, arrays, pointers, and strings. As you make progress, you'll cover code documentation, testing and validation methods, basic input/output, and how to write complete programs in C. By the end of the book, you'll have developed basic programming skills in C, that you can apply to other programming languages and will develop a solid foundation for you to advance as a programmer.
Table of Contents (33 chapters)
Section 1: C Fundamentals
Section 2: Complex Data Types
Section 3: Memory Manipulation
Section 4: Input and Output
Section 5: Building Blocks for Larger Programs

Understanding scope and information hiding

We have seen how to cross linkage boundaries with functions by including header files with their prototypes. If we wanted to limit a function's scope to only its compilation unit, we could do that in one of two ways.

The first way is to remove from the header file any function prototypes we do not want to cross the linkage scope. In that way, any other source file that includes the header will not have the excluded function prototype and will, therefore, be unable to call it. For example, in the sortName.c file from Chapter 23, Using File Input and File Output, only the AddName(), PrintNames(), and DeleteNames() functions were ever called from within the main() function. The other functions in nameList.c did not need to be global. Therefore, nameList.h only needs the following:

#include <stdbool.h>
#include <stdlib.h>

typedef char ListData;

typedef struct _Node ListNode;

typedef struct _Node {