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

Controlling the scanf() input field width

Recall how with printf(), we could control the minimum length of the output string. In a similar way, we can control the maximum length of the input string for conversion with a specifier. For example, %3d will accept no more than three digits for conversion into an integer. The following program reads a group of digits, each of which is intended to represent a date—the first four digits for the year, the next two for the month, and the last two for the day:

#include <stdio.h>
int main( void ) {
int year , month , day;
int numScanned;
while( printf("Enter mmddyyyy (any other character to quit): "),
numScanned = scanf( "%2d%2d%4d" , &month , &day , &year ) ,
numScanned > 0 )
printf( "%d/%d/%d\n" , month , day , year );
printf( "\nDone\n" );

After declaring variables to hold the input values, a while()… loop is used to repeatedly accept eight digits to...