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Full detail And easiest way to learn c aand c ++language
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Lecture 01: Introduction
Lecture 02: Object Oriented Programming
Lecture 03: BASIC CONCEPTS OF OBJECTS ORIENTED PROGRAMMING
Lecture 04: BENEFITS OF OOP
Lecture 05: Basics of C++
Lecture 06: Tokens
Lecture 07: Basic Data types in C++
Lecture 08: Symbolic Constant
Lecture 09: Operators
Lecture 10: Control Structures
Lecture 11: Functions in C++
Lecture 12: Function Overloading
Lecture 13: Class
Lecture 14: Member Function
Lecture 15: Nesting of Member function
Lecture 16: Array with Class
Lecture 17: Static Data Member
Lecture 18: Friendly functions
Lecture 19: Returning Objects
Lecture 20: Constructors
Lecture 21: Destructors
Lecture 22 & 23: Operator Overloading
Lecture 24: Type Conversion
Lecture 25: Class to Basic type
Lecture 26: Inheritance
Lecture 27: Multilevel Inheritance
Lecture 28: Hierarchical Inheritance
Lecture 29: Virtual Base Class
Lecture 30: Polymorphism
Lecture 31: Virtual functions
Lecture 32: Pure Virtual Functions
Lecture 33: C++ function overriding
Lecture 34: Exception Handling
Lecture 35: Array reference out of bound
Lecture 3 6 : Containership in C++
Lecture 37: Template
Lecture 38: Class Template
Lecture 39: Virtual destructors
Lecture 40: Managing Console I/O
Lecture 41: Namespaces
Lecture 42: New & Delete Operators
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Module-1:
LECTURE- 1
Introduction:
Programmers write instructions in various programming languages to perform their computation
tasks such as:
(i) Machine level Language
(ii) Assembly level Language
(iii) High level Language
Machine level Language :
Machine code or machine language is a set of instructions executed directly by a computer's central
processing unit (CPU). Each instruction performs a very specific task, such as a load, a jump, or an
ALU operation on a unit of data in a CPU register or memory. Every program directly executed by a
CPU is made up of a series of such instructions.
Assembly level Language :
An assembly language (or assembler language) is a low-level programming language for a computer,
or other programmable device, in which there is a very strong (generally one-to-one) correspondence
between the language and the architecture's machine code instructions. Assembly language is
converted into executable machine code by a utility program referred to as an assembler; the
conversion process is referred to as assembly, or assembling the code.
High level Language :
High-level language is any programming language that enables development of a program in much
simpler programming context and is generally independent of the computer's hardware architecture.
High-level language has a higher level of abstraction from the computer, and focuses more on the
programming logic rather than the underlying hardware components such as memory addressing and
register utilization.
The first high-level programming languages were designed in the 1950s. Now there are dozens of
different languages, including Ada , Algol, BASIC, COBOL, C, C++, JAVA, FORTRAN, LISP,
Pascal, and Prolog. Such languages are considered high-level because they are closer to human
languages and farther from machine languages. In contrast, assembly languages are considered low-
level because they are very close to machine languages.
The high-level programming languages are broadly categorized in to two categories:
(iv) Procedure oriented programming(POP) language.
(v) Object oriented programming(OOP) language.
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LECTURE- 2
Object Oriented Programing
“Object oriented programming as an approach that provides a way of modularizing programs by
creating partitioned memory area for both data and functions that can be used as templates for
creating copies of such modules on demand”.
Object A Object B
Data Data
Communication
Functions Functions
Object C
Functions
Data
Features of the Object Oriented programming
structure.
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LECTURE- 3
BASIC CONCEPTS OF OBJECTS ORIENTED PROGRAMMING
OBJECTS
Objects are the basic run-time entities in an object-oriented system. They may represent a person, a
place, a bank account, a table of data or any item that the program must handle.
The fundamental idea behind object oriented approach is to combine both data and function
into a single unit and these units are called objects.
The term objects means a combination of data and program that represent some real word
entity. For example: consider an example named Amit; Amit is 25 years old and his salary is 2500.
The Amit may be represented in a computer program as an object. The data part of the object would
be (name: Amit, age: 25, salary: 2500)
The program part of the object may be collection of programs (retrive of data, change age,
change of salary). In general even any user – defined type-such as employee may be used. In the
Amit object the name, age and salary are called attributes of the object.
Object: Student STUDENT
DATA Total
Name
Date-of-birth
Marks Average
FUNCTIONS
Total
Average Display
Display
CLASS:
A group of objects that share common properties for data part and some program part are
collectively called as class.
In C ++ a class is a new data type that contains member variables and member functions that
operate on the variables.
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MESSAGE PASSING :
An object oriented program consists of a set of objects that communicate with each
other.
A message for an object is a request for execution of a procedure and therefore will
invoke a function (procedure) in the receiving object that generates the desired result. Message
passing involves specifying the name of the object, the name of the function (message) and
information to be sent.
Employee. Salary (name)
Object Information
Message
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LECTURE- 4
BENEFITS OF OOP:
Oop offers several benefits to both the program designer and the user. Object-oriented contributes to
the solution of many problems associated with the development and quality of software products.
The principal advantages are :
classes.
another, rather than having to start writing the code from scratch. This leads to saving of
development time and higher productivity.
invaded by code in other parts of the program.
description with external systems much simpler.
APPLICATION OF OOP:
The most popular application of oops up to now, has been in the area of user interface
design such as windows. There are hundreds of windowing systems developed using oop
techniques.
Real business systems are often much more complex and contain many more objects
with complicated attributes and methods. Oop is useful in this type of applications because it
can simplify a complex problem. The promising areas for application of oop includes.
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Cascading Of I/O Operator:
cout<<”sum=”<<sum<<”\n”;
cout<<”sum=”<<sum<<”\n”<<”average=”<<average<<”\n”;
cin>>number1>>number2;
Structure Of A Program :
Probably the best way to start learning a programming language is by writing a program. Therefore,
here is our first program:
// my first program in C++
#include
using namespace std;
int main ()
{
cout << "Hello World!";
return 0;
}
Output:-Hello World!
The first panel shows the source code for our first program. The second one shows the result of the
program once compiled and executed. The way to edit and compile a program depends on the
compiler you are using. Depending on whether it has a Development Interface or not and on its
version. Consult the compilers section and the manual or help included with your compiler if you
have doubts on how to compile a C++ console program.
The previous program is the typical program that programmer apprentices write for the first time,
and its result is the printing on screen of the "Hello World!" sentence. It is one of the simplest
programs that can be written in C++, but it already contains the fundamental components that every
C++ program has. We are going to look line by line at the code we have just written:
// my first program in C++
This is a comment line. All lines beginning with two slash signs (//) are considered comments and do
not have any effect on the behavior of the program. The programmer can use them to include short
explanations or observations within the source code itself. In this case, the line is a brief description
of what our program is.
#include
Lines beginning with a hash sign (#) are directives for the preprocessor. They are not regular code
lines with expressions but indications for the compiler's preprocessor. In this case the directive
#include
(iostream) includes the declarations of the basic standard input-output library in C++, and it is
included because its functionality is going to be used later in the program.
using namespace std;
All the elements of the standard C++ library are declared within what is called a namespace, the
namespace with the name std. So in order to access its functionality we declare with this expression
that we will be using these entities. This line is very frequent in C++ programs that use the standard
library, and in fact it will be included in most of the source codes included in these tutorials.
int main ()
This line corresponds to the beginning of the definition of the main function. The main function is
the point by where all C++ programs start their execution, independently of its location within the
source code. It does not matter whether there are other functions with other names defined before or
after it – the instructions contained within this function's definition will always be the first ones to be
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executed in any C++ program. For that same reason, it is essential that all C++ programs have a main
function.
The word main is followed in the code by a pair of parentheses (()). That is because it is a function
declaration: In C++, what differentiates a function declaration from other types of expressions are
these parentheses that follow its name. Optionally, these parentheses may enclose a list of parameters
within them.
Right after these parentheses we can find the body of the main function enclosed in braces ({}).
What is contained within these braces is what the function does when it is executed.
cout << "Hello World!";
This line is a C++ statement. A statement is a simple or compound expression that can actually
produce some effect. In fact, this statement performs the only action that generates a visible effect in
our first program.
cout represents the standard output stream in C++, and the meaning of the entire statement is to
insert a sequence of characters (in this case the Hello World sequence of characters) into the standard
output stream (which usually is the screen).
cout is declared in the iostream standard file within the std namespace, so that's why we needed to
include that specific file and to declare that we were going to use this specific namespace earlier in
our code.
Notice that the statement ends with a semicolon character (;). This character is used to mark the end
of the statement and in fact it must be included at the end of all expression statements in all C++
programs (one of the most common syntax errors is indeed to forget to include some semicolon after
a statement).
return 0;
The return statement causes the main function to finish. return may be followed by a return code (in
our example is followed by the return code 0). A return code of 0 for the main function is generally
interpreted as the program worked as expected without any errors during its execution. This is the
most usual way to end a C++ console program.
You may have noticed that not all the lines of this program perform actions when the code is
executed. There were lines containing only comments (those beginning by //). There were lines with
directives for the compiler's preprocessor (those beginning by #). Then there were lines that began
the declaration of a function (in this case, the main function) and, finally lines with statements (like
the insertion into cout), which were all included within the block delimited by the braces ({}) of the
main function.
The program has been structured in different lines in order to be more readable, but in C++, we do
not have strict rules on how to separate instructions in different lines. For example, instead of
int main ()
{
cout << " Hello World!";
return 0;
}
We could have written:
int main ()
{
cout << "Hello World!";
return 0;
}
All in just one line and this would have had exactly the same meaning as the previous code.
In C++, the separation between statements is specified with an ending semicolon (;) at the end of
each one, so the separation in different code lines does not matter at all for this purpose. We can
write many statements per line or write a single statement that takes many code lines. The division of
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{
char name[30];
int age;
public:
void getdata(void);
void display(void);
};
void person :: getdata ( void )
{
cout<<”enter name”;
cin>>name;
cout<<”enter age”;
cin>>age;
}
void display()
{
cout<<”\n name:”<<name;
cout<<”\n age:”<<age;
}
int main( )
{
person p;
p.getdata();
p.display();
return(0);
}
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LECTURE- 6
TOKENS:
The smallest individual units in program are known as tokens. C++ has the following
tokens.
i. Keywords
ii. Identifiers
iii. Constants
iv. Strings
v. Operators
KEYWORDS:
The keywords implement specific C++ language feature. They are explicitly reserved
identifiers and can’t be used as names for the program variables or other user defined program
elements. The keywords not found in ANSI C are shown in red letter.
Asm double new switch
Auto else operator template
Break enum private this
Case extern protected throw
Catch float public try
Char for register typedef
Class friend return union
Const goto short unsigned
Continue if signed virtual
Default inline sizeof void
Delete long struet while
IDENTIFIERS:
Identifiers refers to the name of variable , functions, array, class etc. created by programmer. Each
language has its own rule for naming the identifiers.
The following rules are common for both C and C++.
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Lecture- 7
BASIC DATA TYPES IN C++
C ++ Data Types
User defined type Built in types Derived type
Structure Array
Union Function
Class pointer
enumeration
Integral type void Floating point
int char float double
Both C and C++ compilers support all the built in types. With the exception of void the basic
datatypes may have several modifiers preceding them to serve the needs of various situations. The
modifiers signed, unsigned, long and short may applied to character and integer basic data types.
However the modifier long may also be applied to double.
Data types in C++ can be classified under various categories.
TYPE BYTES RANGE
char 1 - 128 to – 127
usigned 1 0 to 265
sgned char 1 - 128 to 127
int 2 - 32768 to 32768
unsigned int 2 0 to 65535
singed int 2 - 32768 to 32768
short int 2 - 32768 to 32768
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long int 4 - 2147483648 to 2147483648
signed long int 4 - 2147483648 to 2147483648
unsigned long int 4 0 to 4294967295
float 4 3.4E-38 to 3.4E+
double 8 1.7E - 308 to 1.7E +
long double 10 3.4E-4932 to 1.1E+ 4932
The type void normally used for:
To specify the return type of function when it is not returning any value.
To indicate an empty argument list to a function.
Example:
Void function(void);
Another interesting use of void is in the declaration of genetic pointer
Example:
*Void gp;
Assigning any pointer type to a void pointer without using a cast is allowed in both C and ANSI C.
In ANSI C we can also assign a void pointer to a non-void pointer without using a cast to non void
pointer type. This is not allowed in C ++.
Example:
v *oid ptr1;
*void ptr2;
Are valid statement in ANSI C but not in C++. We need to use a cast operator.
p tr2=(char * ) ptr1;
STRUCTERS AND CLASSES
We have used user defined data types such as struct,and union in C. While these more features have
been added to make them suitable for object oriented programming. C++ also permits us to define