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

Reading numerical input with scanf()

To begin our exploration of scanf(), we begin by reading an integer and a double from the console. Rather than attempt to explain how scanf() interprets the input, I believe it would be far better to first get an intuitive experience of how it works. We begin with the following program:

#include <stdio.h>

int main( void ) {
int anInteger = -1;
doubleaDouble = -1.0;

printf( "Enter an integer and a decimal number: " );
scanf( "%d%lf" , &anInteger , &aDouble );
printf( "1. integer:%d\n" , anInteger );
printf( "2.double:%lf\n" , aDouble );

This simple program first initializes values that will be used to store input. If scanf() can't assign values, we will see these default values. We will use two simple numbers for now. However, as we will see, if the user enters these numbers, we will be unable to tell whether they are default values that were not assigned by scanf() or...