Introducing C Chapter 1 Copyright © 2008 W. W. Norton & Company.

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Introducing C Chapter 1 Copyright © 2008 W. W. Norton & Company. All rights reserved.

Properties of C C is an imperative computer programming language. Low-level It is based on program statements to describe the operations in details. Small Compiler and library codes take little memory space. Permissive (allows all kinds of low level coding) Flexibility is a disadvantage as well as an advantage. It may not warn you if you make mistakes in coding, assuming that you made it on purpose. Copyright © 2008 W. W. Norton & Company. All rights reserved.

Origins of C C is a by-product of UNIX, developed at Bell Laboratories by Ken Thompson, Dennis Ritchie, and others. The language was stable enough by 1973 that UNIX could be rewritten in C. Copyright © 2008 W. W. Norton & Company. All rights reserved.

Standardization of C K&R C C89/C90 C99 Described in Kernighan and Ritchie, The C Programming Language (1978) De facto standard C89/C90 ANSI standard X3.159-1989 (completed in 1988; formally approved in December 1989) International standard ISO/IEC 9899:1990 C99 International standard ISO/IEC 9899:1999 Incorporates changes from Amendment 1 (1995) Copyright © 2008 W. W. Norton & Company. All rights reserved.

C-Based Languages C++ includes all the features of C, but adds classes and other features to support object-oriented programming. Java is based on C++ and therefore inherits many C features. C# is a more recent language derived from C++ and Java. Perl has adopted many of the features of C. Copyright © 2008 W. W. Norton & Company. All rights reserved.

Strengths of C Weaknesses of C Efficiency Portability Power Flexibility Standard library Integration with UNIX Programs can be error-prone. (Open to errors) Programs can be difficult to understand. Programs can be difficult to modify. Copyright © 2008 W. W. Norton & Company. All rights reserved.

Effective Use of C Learn how to avoid pitfalls. Use software tools (lint, debuggers) to make programs more reliable. Take advantage of existing code libraries. Adopt a sensible set of coding conventions. Avoid “tricks” and overly complex code. Stick to the standard. Copyright © 2008 W. W. Norton & Company. All rights reserved.