Oosd lecture unit 4 ppt introduction part

OVERVIEW OF C LANGUAGE:
1.C language is known as structure oriented language or procedure oriented language
2.Employs top-down programming approach where a problem is viewed as a sequence of tasks to
be performed.
3.All program code of c can be executed in C++ but converse many not be possible
4. Function overloading Polymorphism, encapsulation, inheritance and operator overloading are not
possible.
5. Local variables can be declared only at the beginning of the block.
6. Program controls are through jumps and calls to subroutines.
7.For solving the problems, the problem is divided into a number of modules. Each module is a
subprogram.
8. Data abstraction property is not supported by procedure oriented language.
9. Data in procedure oriented language is open and can be accessed by any function.

OVERVIEW OF C++ LANGUAGE:
1. C++ can be considered as an incremental version of c language which consists all programming
language constructs with newly added features of object oriented programming.
2. C++ is object oriented programming language.
3. The file extension of C++ program is “.CPP”
4. Function overloading, Polymorphism, encapsulation, inheritance and operator overloading are
possible.
5. Variables can be declared in inline i.e. when required
6. In c++ more emphasis is give on data rather than procedures.
7. Data abstraction property is supported by c++.
8. Data access is limited. It can be accessed by providing various visibility modes both for data and
member functions.
9. Dynamic binding is supported by C++

DIFFERENCE BETWEEN PROCEDURE ORIENTED PROGRAMMING
(POP) & OBJECT ORIENTED PROGRAMMING (OOP)

BASIC STRUCTURE OF C++ LANGUAGE:
A C++ program should have one or more sections but the sequence of sections is
to be followed.
1. Documentation section
2. Linking section
3. Definition section
4. Global declaration section & class declarations
5. Member function definition
6. Main function

1. DOCUMENTATION SECTION :
1. Document section comes first and is used to document the use of logic or
reasons in your program.
2. It can be used to write the program's objective, developer and logic
details.
3. The documentation is done in C++ language with /* and */ . Whatever is
written between these two are called comments.

2. LINKING SECTION :
1. This section tells the compiler to link the certain occurrences of keywords or functions
in your program to the header files specified in this section.
2. e.g. #include<iostream>
using namespace std;
3. Directive causes the preprocessor to add the contents of the iostream file to the
program. It contains declarations for cout and cin.
4. cout is a predefined object that represents the standard output stream. The operator
<< is an insertion operator, causes the string in double quotes to be displayed on the
screen.
5. The identifier cin is a predefined object in C++ that corresponds to the standard input
stream. The operator >> is known as extraction operator. It extracts the value from the
keyboard and assigns it to the value variable on its right.

3. DEFINITION SECTION :
1. It is used to declare some constants and assign them some value. e.g.
#define MAX 25
2. Here #define is a compiler directive which tells the compiler whenever MAX is
found in the program replace it with 25.

4. GLOBAL DECLARATION SECTION :
1. Here the variables and class definitions which are used throughout the
program (including main and other functions) are declared to make them global
(i.e
accessible to all parts of program).
2. A CLASS is a collection of data and functions that act or manipulate
the data. The data components of a class are called data members and
function components of a class are called member functions.
3. A class can also termed as a blue print or prototype that defines the variable or
functions common to all objects of certain kind.
4. It is a user defined data type.
5. e.g. int i; //this declaration is done outside and before main()

5. SUB PROGRAM OR FUNCTION SECTION :
This has all the sub programs or the functions which our
program needs.
void display()
{
cout<<”C++ is better that C”;
}

6. MAIN FUNCTION SECTION :
 It tells the compiler where to start the execution.
main()
{
point from execution starts
}
main function has two sections
1. declaration section : In this the variables and their data types are
declared.
2. Executable section or instruction section : This has the part of
program which actually performs the task we need.

Oosd lecture unit 4 ppt introduction part

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