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

Assigning values by passing function parameters

When we declare a function prototype that takes parameters, we also declare those parameters as formal parameters. Formal parameters have no value, only a type and, optionally, a name. However, when we call the function, we supply the actual parameters, which are the values that are copied into those placeholder parameters.

Consider theprintDistance()function declaration and definition in the following program:

#include <stdio.h>

void printDistance( double );

int main( void )
double feet = 5280.0;
printDistance( feet );
printf( "feet = %12.3g\n" , feet );
return 0;

// Given feet, print the distance in feet and yards.
void printDistance( double f )
printf( "The distance in feet is %12.3g\n" , f );
f = f / 3.0 ;
printf( "The distance in yards is %12.3g\n" , f );

In this function, we focus on the assignment that occurs between the function call and the execution...