C++ programming

Programming in C++ :-

Programming in C++ can be done on Turbo C++,Microsoft Visual Studio IDE very easily they provide built- in editor and menu bar ,program should be saved with .cpp file extension in it like example.cpp.

C++ programmer should know about the data types used in it.

There are 3 types of it:-

1.Built-in data types

2.User defined

3.Derived

1.Built-in type include 3 types they areas follows:-

    I)Integral - i)int

                     ii)char

    II)Floating - i)float

                      ii)double

2.User defined type include 4 types they areas follows:-

    I ) Structure

    II ) Union

    III ) Class

    IV ) Enumeration

3.Derived  type include 3 types they areas follows:-

     I ) Pointer

    II ) Array

    III ) Function

           Each of the fundamental types has a fixed size that determines the range of values that can be stored in them (for integers) or the precision and range of those values (for floating point numbers). A char variable is of the natural size to hold a character on a given machine (typically an 8-bit byte), and the sizes of other types are quoted in multiples of the size of a char. The size of a type is implementation defined (i.e., it can vary among different machines) and can be obtained by the size of operator; for example size of (char) equals 1 and size of (int) is often 4.

          Simple programming in C++ can be done using header files mostly used header file in simple programming is #include<iostream.h> it means that there are built in standard C++ library which has iostream file file in above case where io means the input and output steam in programming <> these are the brackets for header file.It is use to take and display the data from cin>> and cout<< where << and >> are the operators.

Memory management :-

C++ supports four types of memory management:

  1.Static memory allocation. :- 

    A static variable is assigned a value at compile-time, and allocated storage in a fixed location along with the executable code. These are declared with the "static" keyword (in the sense of static storage, not in the sense of declaring a class variable).

  2. Automatic memory allocation. :-

     An automatic variable is simply declared with its class name, and storage is allocated on the stack when the value is assigned. The constructor is called when the declaration is executed, the destructor is called when the variable goes out of scope, and after the destructor the allocated memory is automatically freed.

  3.Dynamic memory allocation.:-

     Storage can be dynamically allocated on the heap using manual memory management - normally calls to new and delete (though old-style C calls such as malloc() and free() are still supported).

  4.Garbage collection :-

    With the use of a library, garbage collection is possible. The Boehm garbage collector is commonly used for this purpose.

The fine control over memory management is similar to C, but in contrast with languages that intend to hide such details from the programmer, such as Java, Perl, PHP, and Ruby.

Operators and operator overloading:-

1. C++ provides more than 35 operators, covering basic arithmetic, bit manipulation, indirection, comparisons, logical operations and others.
2. Almost all operators can be overloaded for user-defined types, with a few notable exceptions such as member access (. and .*) as well as the conditional operator.
3. The rich set of over-loadable operators is central to using user created types in C++ as well and as easily as built in types.
4.The over-loadable operators are also an essential part of many advanced C++ programming techniques, such as smart pointers.
5. Overloading an operator does not change the precedence of calculations involving the operator, nor does it change the number of operands that the operator uses.
6.Overloaded "&&" and "||" operators lose their short-circuit evaluation property.

Features of object-oriented programming :-

1. Programs are divided into objects and different objects communicate with each through messages,called methods.
2. Emphasis is given on data rather than procedure.
3. Data is hidden and can't be accessed or altered by external functions.
4. Functions operating on data of  an object are encapsulated.
5. New data and functions can be easily added whenever necessary.
6. Follows bottom-up approach in program design.

C++ fully supports object-oriented programming,including the four pillars of object-oriented development:-
  I)   Abstraction
  II)  Encapsulation
  III)  Inheritance
  IV) Polymorphism

C++ as Object Oriented Language:
      Object Oriented programming techniques are the best ways,to develop large ,complex software applications and systems.C++ can be used both as an OOPL and simply as a better C.C++ programs are fast and  efficient,which helped to make C++,an extremely popular language.It uses templates,static polymorphism,dynamic polymorphism,generic programming,inheritance;data binding and encapsulation,etc. which covers most of  the object-oriented concepts.
      Also C++ supports a programming technique that allows memory management to be safe and implicit.There are constructors and destructors in C++ programming which has god  role for programming.
The constructors are those which have the same name function as that of class in the a program.

TOKENS
The smallest individual units in aprogram are known as tokens.C++ has the following tokens:

• Keywords
• Identifiers
• Constants
• String
• Operators

A C++ program is written using those tokens,white-spaces,and syntax of the language.