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 the simple input and output of strings with gets() and puts()

The following program demonstrates the use of gets() and puts():

#include <stdio.h>

const int bufferSize = 80;

int main( void ) {
char stringBuffer[ bufferSize ];

printf( "Enter a string: " );
gets( stringBuffer );
puts( "You entered:" );
puts( stringBuffer );

This program first declares a string buffer. Next, it provides a user prompt, and then it reads the input into the string buffer withgets(). It then callsputs()twice—once to give a label string and again to write out what the user entered.

You may recall that this program is very similar to readString.c, which we created earlier. Copy the readString.cprogram into the readString2.cfile and modify it to match the preceding program. Save, compile, and run it. You should see something like the following output:

Notice that the C runtime gave a warning about using gets...