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

Accessing pointer targets

A pointer must know the type of the value it points to so that it can correctly get the correct number of bytes for that value. Without an associated type, pointer access would not know how many bytes to use when returning a value. For example, an int value is 4 bytes. An integer pointer (8 bytes) would then go to its address and get 4 bytes to return an int value in the correct range.

To access a value indirectly via a pointer variable, we must dereference the pointer. That is to say, we must use the address stored in the pointer variable to go get the value it points to; or, we go to its target. To assign a value to the pointer's target, we use the * operator, as follows:

int  height;
int* pDimension = &height;
height = 10;
*pDimension = 15;

height is assigned a value of 10 directly through that variable identifier. In the next statement, 15 is assigned to the target of pDimension. Because pDimension points to...