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 pointers to structures in functions

Now that we can use an indirect reference (a pointer) to a structure variable as easily as we can with a direct reference (a variable identifier) to a structure variable, we can use the indirect reference in function parameters to avoid the unnecessary copying of structures to temporary function variables. We can use the structure pointer in function parameters, as follows:

void printDate( Date* pDate );

We declare the pointer to the structure type in the function declaration. We then define the function, accessing each element as follows:

void printDate( Date* pDate )  {
int m, d , y;
m = pDate->month;
d = pDate->day;
y = pDate->year;
printf( "%4d-%2d-%2d\n" , y , m , d );

// or

printf( %4d-%2d-%2d\n" , pDate->year , pDate->month , pDate->day );

In the definition of printDate(), we can create local variables and assign the dereferenced pointer values to them...