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

Using argc and argv

So, while we could give alternate names for the argc and argvparameter names, we will use these two names throughout this chapter for consistency.

When we invoke a program, we now see the following:

  • Memory is allocated in program space.
  • Command-line arguments are processed into function parameters passed into main() or ignored if those parameters are absent.
  • The execution begins with a call to main().

The first thing to note is that every argument from the command line is broken up into strings. A pointer to the beginning of each string is placed in argv, and argcarray is incremented. In many cases, string input is sufficient without any further processing. We will explore converting string input into other values in the next chapter, Chapter 21, Exploring Formatted Input.

The program name itself is always placed in argv[0]. Therefore, argc will always be at least 1.

Each argument...