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 array elements via pointers

Arithmetic can be performed with addresses. Therefore, we can access the elements of array using a pointer plus an offset, as follows:

*(pArray1 + 0) = 1;  // first element (zeroth offset)
*(pArray1 + 1) = 2; // second element (first offset)
*(pArray1 + 2) = 3; // third element (second offset)
*(pArray1 + 3) = 4; // fourth element (third offset)
*(pArray1 + 4) = 5; // fifth element (fourth offset)

Since pArray is a pointer, the * go-to address of notation must be used to access the value at the address of that pointer. In the second through fifth elements, we must first add an offset value and then go to that computed address. Note that we must use ( and ) to properly calculate the address before assigning the value there. Also, note that *(pArray1 + 0) is identical to the abbreviated version, *pArray1.

You may have already noticed how adding an offset to a base address (pointer) is very similar to using an array name...