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

The two forms of main()

Up to now, we have been using the first form of main():

int main( void ) { ... }

The second form of main() is as follows:

int main( int argc , char* argv[] ) { ... }

Here, we have the following:

  • argc is the short name for the argument count.
  • argv is the short name for the argument vector.

When our program declares the main() function in the second form, the command-line interpreter processes the command line and populates these two variables, passing them into the main() function body when the system calls main(). We can then access those values through these variable names.

It should be noted that argc and argv are arbitrary names. You might want to use alternative names in main(), as follows:

int main( int argumentCount, char* argumentVector[] ) { ... }

You could even use the following:

int main( int numArgs, char* argStrings[] ) { ... }