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An Overview of C
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Copyright 2001 The McGraw-Hill Companies, Inc Click Here for Terms of Use
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Borland C++ Builder: The Complete Reference
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his chapter presents an overview of the origins, uses, and philosophy of the C programming language
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The Origins of the C Language
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Dennis Ritchie invented and first implemented the C programming language on a DEC PDP-11 that used the UNIX operating system The language is the result of a development process that started with an older language called BCPL Martin Richards developed BCPL, which influenced Ken Thompson s invention of a language called B, which led to the development of C in the 1970s For many years, the de facto standard for C was the version supplied with the UNIX operating system It was first described in The C Programming Language by Brian Kernighan and Dennis Ritchie (Englewood Cliffs, NJ: Prentice-Hall, 1978) In the summer of 1983, a committee was established to create an ANSI (American National Standards Institute) standard that would define the C language The standardization process took six years (much longer than anyone reasonably expected) The ANSI C standard was finally adopted in December 1989, with the first copies becoming available in early 1990 The standard was also adopted by ISO (International Standards Organization), and the resulting standard was typically referred to as ANSI/ISO Standard C, or simply ANSI/ISO C In 1995, Amendment 1 to the C standard was adopted, which, among other things, added several new library functions The 1989 standard for C, along with Amendment 1, became a base document for Standard C++, defining the C subset of C++ The version of C defined by the 1989 standard is commonly referred to as C89 This is the version of C that C++ Builder supports It must be noted that recently a new standard for C, called C99, has been created For the most part, it leaves the features of C89 intact and adds a few new ones However, C++ Builder does not support the new features added by C99 This is not surprising because at the time of this writing, no commonly available compiler supports C99, and C89 still describes what programmers think of as C Furthermore, as just explained, it is the C89 version of C that forms the C subset of C++ Because the version of C supported by C++ and C++ Builder is C89, it is the version of C described in this book (The interested reader can find a full description of the C99 standard in C: The Complete Reference, 4th Ed by Herbert Schildt, Berkeley: Osborne/McGraw-Hill, 2000)
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A Middle-Level Language
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C is often called a middle-level computer language This does not mean that C is less powerful, harder to use, or less developed than a high-level language such as Pascal; nor does it imply that C is similar to, or presents the problems associated with, assembly language The definition of C as a middle-level language means that it combines elements of high-level languages with the functionalism of assembly language Table 1-1 shows how C fits into the spectrum of languages
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An Overview of C
As a middle-level language, C allows the manipulation of bits, bytes, and addresses the basic elements with which the computer functions Despite this fact, C code is surprisingly portable Portability means that it is possible to adapt software written for one type of computer to another For example, if a program written for one type of CPU can be moved easily to another, that program is portable All high-level programming languages support the concept of data types A data type defines a set of values that a variable can store along with a set of operations that can be performed on that variable Common data types are integer, character, and real Although C has several basic built-in data types, it is not a strongly typed language like Pascal or Ada In fact, C will allow almost all type conversions For example, character and integer types may be freely intermixed in most expressions Traditionally C performs no run-time error checking such as array-boundary checking or argument-type compatibility checking These checks are the responsibility of the programmer A special feature of C is that it allows the direct manipulation of bits, bytes, words, and pointers This makes it well suited for system-level programming, where these operations are common Another important aspect of C is that it has only 32 keywords (5 more were added by C99, but these are not supported by C++), which are the commands that make up the C language This is far fewer than most other languages
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