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

Printing pointer values

The last bit of code prints out the value of a pointer using two different methods, as follows:

 printf( "\nPointer Output\n" );
printf( " %%p [%p] pointer\n" , &smallInt );
printf( " %%#lx [%#lx] using hex\n\n" , (unsigned long)&smallInt );

The first method uses the p type conversion. Notice that no casting is required. The second method uses the #lx specifier; this must be specified as a long hex value to get the full 64-bit pointer value and not a 32-bit one. Notice the address of smallInt must be cast to an unsigned long variable or a compilation error will result. In this instance, we are coercing the &smallIntpointer type to match the integer type specified by%#lx. Both printed values of &smallIntshould match. Theptype conversion is certainly simpler and safer.

Enter these code snippets into unsignedInt.c. Compile and run the program. You should see something similar to the following...