C Plus Plus - Wikipedia

C++ (pronounced "see plus plus") is a multi-paradigm programming language, which supports object-oriented programming; developed, during the 1980s, by Bjarne Stroustrup of Bell Labs. C++ is derived from C. C++ was standardized in 1998 (ISO/IEC 14882-1998[?]). Along with it's object-oriented design, C++ is distinguished from C with its support for generic programming[?] and template metaprogramming; via alias types[?], in-line expansion, templates, and //-commenting. In-line expansion and //-commenting were added to C, as part of the C99 update.

Table of contents showTocToggle("show","hide")

1 History of C++

2 History of the Name "C++"

3 Ownership of C++

4 "Hello Wikipedia!" Program

4.1 Class definition

5 C++ library

6 External Links

History of C++

Stroustrup began work on the language in 1979, inspired by Simula67[?], and the language was first used, by AT&T, in August 1983. The original compiler was Cfront. The first commercial release was in October 1985.

History of the Name "C++"

While most C is valid C++, C is not a subset of C++; although, the names do indicate a distinct relationship. This name is credited to Rick Mascitti[?] (mid-1983) and was first used in December '83. Earlier, during the research period, the developing language had been referred to as "C with Classes". The name stems from C's "++" operator (which increments the value of a variable) and a common naming convention of using "+" to indicate an enhanced computer program, for example: "Wikipedia+". According to Stroustrup: "the name signifies the evolutionary nature of the changes from C". C+[?] was earlier used as the name for an unrelated program.

Some C programmers have noted that if the statements x=3; and y=x++; are executed, then x==4 and y==3. However, if the second statement is y=++x;, then y=4 and x=4.

Following such reasoning, a more proper name for C++ might actually be ++C. However, other C programmers do use the expression "c++" to increment the variable "c".

Ownership of C++

Nobody owns C++. Stroustrup and AT&T are not paid royalties for the usage of C++.

"Hello Wikipedia!" Program

The below code can be compiled into a program which outputs a text message. See also: Hello world program

#include <iostream> // The <iostream> header is needed for std::cout
 
int main() // Beginning of main() function
{          // { ... } is used to include blocks of code
    std::cout << "Hello, Wikipedia!\n"; // Outputs the text enclosed by ""
}

Note that older (non-standard) C++ compilers (such as Borland C++ 5.02[?]) usually require <iostream.h> instead of the standard <iostream>, and cout instead of std::cout.

Class definition

#include <string>
using std::string;

class InetMessage
{
  string m_subject, m_to, m_from;

public:
  InetMessage (const string& subject,
	       const string& to,
	       const string& from);
  string subject () const;
  string to () const;
  string from () const;
};

C++ library

The C++ standard library is mostly a superset of of the C standard library. A large part of the C++ library comprises the Standard Template Library (STL). The STL provides such useful tools as iterators (which are like high-level pointers) and containers (whuch are like arrays that can automatically grow to include new elements). As in C, the features of the library are accessed by using the #include directive to include a standard header. There are fifty non-deprecated standard headers provided in C++:

<algorithm>
<bitset>
<cassert>
<cctype>
<cerrno>
<cfloat>
<ciso646>
<climits>
<clocale>
<cmath>
<complex>
<csetjmp>
<csignal>
<cstdarg>
<cstddef>
<cstdio>
<cstdlib>
<cstring>
<ctime>
<cwchar>
<cwctype>
<deque>
<exception>
<fstream>
<functional>
<iomanip>
<ios>
<iosfwd>
<iostream>
<istream>
<iterator>
<limits>
<list>
<locale>
<map>
<memory>
<new>
<numeric>
<ostream>
<queue>
<set>
<sstream>
<stack>
<stdexcept>
<streambuf>
<string>
<typeinfo>
<utility>
<valarray>
<vector>

The headers of the form <cfoo> correspond to the C headers of the form <foo.h> (except for <complex>, which is new in C++). These C headers are also allowed in C++, but are deprecated. A compatibility header <strstream> is also provided and deprecated.

External Links

GNAcademy.Org:TWiki C++ Web (http://www.gnacademy.org/twiki/bin/view/CPP/WebHome)
Stroustrup's C++ FAQ (http://www.research.att.com/~bs/bs_faq.html)