Best Books for Learning C Programming: A Comprehensive Guide
Computer programming revolves around problem-solving using computers - essentially instructing a computer to handle repetitive and complex tasks for us. The fundamental cycle of developing a program involves identifying the necessary steps to solve a problem and then translating those steps into instructions the computer can execute.
Getting Started with C: The "Hello, World!" Program
One of the most basic and universally used programs in C is the "Hello, world!" program. This program, popularized by Brian W. Kernighan and Dennis M. Ritchie in their seminal work, The C Programming Language (1978), simply prints the greeting "Hello, world!" to the console.
This seemingly simple program serves several crucial purposes:
- Introduction to C syntax: It provides a glimpse into the structure and syntax of a C program.
- Verification of the development environment: It confirms that the operating system, text editor, command-line interface, and compiler are correctly installed and functioning.
- First taste of the development cycle: It introduces the fundamental steps involved in writing, compiling, and running a C program.
The "Hello, world!" program demonstrates the basic programming development cycle. In the process of learning to program and, later, actually solving real problems with programming, you will repeat this cycle often. This program is useful because it prints something out to the Terminal, also known as the console, telling us that it actually did something - it displays a message to us. We could write shorter programs in C but they would not be of much use. We would be able to build and run them but would have little evidence that anything actually happened.
Understanding the C Development Environment
In a compiled environment like C, programs are written in text files called source files, which typically have the .c extension. Header files, denoted by the .h extension, are also used to store declarations and definitions that are shared across multiple source files.
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To write and modify C source files, you'll need a plain text editor. A plain text editor allows you to open, modify, and save plain text without any formatting such as font size, font family, font style, and much more. For instance, on Windows, Notepad is a plain text editor while Word is not.
The compiler is the heart of the C development process. It translates the human-readable source code into machine language, the series of instructions and data that a computer's CPU can directly execute. Each CPU has its own machine language or instruction set. When we compile our programs, we invoke the compiler to process one or more source files. The result of this invocation is either a success and an executable file is generated or it will identify the programming errors it found during compilation. Programming errors can be a simple misspellings of names or omitted punctuation, to more complex syntax errors.
A complete, runnable program consists of our compiled source code - the code we write - and predefined compiled routines that come with the OS - code written by the authors of the OS. The predefined program code is sometimes called the runtime library. It consists of a set of callable routines that know how to interact in detail with the various parts of the computer.
Setting up Your C Compiler
You can learn C on many computer platforms. Common compilers in use on Unix and Linux OS are the GNU Compile Collection (GCC) or the LLVM compiler project, clang. For Windows, GCC is available via the Cygwin Project or the MinGW Project. You could even learn C using a Raspberry Pi or Arduino, but this is not ideal because of special considerations for these minimal computer systems.
Here are the steps to follow to install a C compiler on the major desktop computer environments - Linux, macOS, and Windows. For other platforms, you'll have to do some investigation to find the compiler you need. If you are running a Red Hat Package Manager (RPM)-based Linux, such as RedHat, Fedora, or CentOS, enter this command from the command line:$ sudo yum group install development-toolsIf you are running Debian Linux, open a Terminal window and enter this command from the command line:$ sudo apt-get install build-essentialVerify your installation by entering this command from the command line:$ cc --versionFrom the preceding command, you will see that you likely have GCC or clang. Either one is fine. Open Terminal.app and enter the following at the command line:$ cc --versionIf the development tools have not been installed yet, simply invoking the preceding command will guide you through their installation. Either one will work well. If you choose to install Cygwin, be sure to also install the extra package for the GNU Compiler Collection (GCC). This will install a number of other required compiler and debugging programs with GCC. You are now ready to compile C programs on your version of Windows.
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Compilation is a two-part process - compiling and linking. Compiling involves syntax checking and converting source code into nearly-complete executable code. In the linking phase, the nearly-complete machine code is merged with the runtime library and becomes complete. Typically, when we invoke the compiler, the linker is also invoked. If the compiler phase succeeds (no errors), the linking phase is automatically invoked.
The Importance of Verification
At this point in the cycle, you may feel that just getting your program to compile without errors and running it without crashing your computer means you are done. However, you are not. You must verify that what you think your program was supposed to do is what it actually did do. Did your program solve the problem it was intended to? So, you have to return to writing your original program and then compare that to the output your program gives. If your intended result matches, your program is correct.
Recommended Books for Learning C Programming
Choosing the right resources is crucial for mastering C programming. Here's a curated list of books, catering to different learning styles and experience levels:
The C Programming Language (2nd Edition) by Brian W. Kernighan and Dennis M. Ritchie: Often referred to as "K&R," this book is a classic and considered the definitive guide to C. Written by the creators of the language, it provides a comprehensive and concise explanation of C's features. It is still a good, short, but complete, introduction to C (C89, not C99 or later versions), written by the inventor of C. K&R is a religious scripture, and remains the benchmark against which I measure all other programming books. It's in the same league as the aspirational SICP, and a far easier read.
C: A Reference Manual (5th Edition) by Samuel P. Harbison and Guy R. Steele: This book serves as an excellent reference for C, covering up to the C99 standard. It's not a tutorial, so it's best suited for those with some existing C knowledge.
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C Programming: A Modern Approach (2nd Edition) by K. N. King: This book offers a contemporary perspective on C programming, covering both the traditional C89 and the newer C99 standard. It emphasizes practical examples and problem-solving techniques.
Programming in C (4th Edition) by Stephen Kochan: This book is known for its clear and easy-to-understand explanations, making it suitable for beginners.
C Interfaces and Implementations - David R. Hanson (1997): Provides information on how to define a boundary between an interface and implementation in C in a generic and reusable fashion. It also demonstrates this principle by applying it to the implementation of common mechanisms and data structures in C, such as lists, sets, exceptions, string manipulation, memory allocators, and more.
Additional Resources
- The comp.lang.c FAQ: A valuable resource for answering common questions about C programming.
- The new C standard - an annotated reference (Free PDF) by Derek M. Jones: A free resource that provides an annotated reference to the C standard.
- Essential C (Free PDF) by Nick Parlante: A concise and accessible introduction to C programming.
- C Programming FAQs: Frequently Asked Questions - Steve Summit (1995): This is the book of the web site listed earlier.
Books to Approach with Caution
- Books by Herbert Schildt: Some programmers advise caution when using books by Herbert Schildt.
- Let Us C (16th Edition, 2017) by Yashavant Kanetkar: This book is considered outdated by many and may contain obsolete or misleading information.
- Learn C The Hard Way (2015) by Zed Shaw: Some reviewers have criticized this book for oversimplification and potential inaccuracies.
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