From Beginning
C++ is an extension of C developed by Bjarne Stroustrup in the early 1980s. It incorporates object-oriented programming (OOP) features, enabling more complex data structures and design patterns.
Object-Oriented Programming: Supports OOP principles such as encapsulation, inheritance, and polymorphism, allowing for the creation of modular and reusable code.
Standard Template Library (STL): Provides a powerful library of template classes and functions, including containers (vectors, lists, maps), algorithms, and iterators.
Operator Overloading: Enables programmers to redefine the way operators work with user-defined types, enhancing code readability.
Memory Management: Offers dynamic memory management features through pointers and references, providing flexibility in resource allocation.
Compatibility with C: Most C code can be compiled as C++ code, ensuring compatibility and leveraging existing C libraries.
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C++ is an object-oriented programming language that was introduced to overcome the jurisdictions where C was lacking. By object-oriented we mean that it works with the concept of polymorphism, inheritance, abstraction, encapsulation, object, and class.
Advantages of C++:
A class is like a blueprint of an object. It is a user-defined data type with data members and member functions and is defined with the keyword class.
You define objects as an instance of a class. Once it creates the object, then it can operate on both data members and member functions.
You use access modifiers to define accessibility for the class members. It defines how to access the members of the class outside the class scope.
There are three types of access modifiers:
The equal to operator == checks whether two values are equal or not. If equal, then it’s true; otherwise, it will return false.
The assignment operator = allots the value of the right-side expression to the left operand.
?: operator cannot be overloaded because it is not syntactically possible.
Yes, you can compile a program without the main function, but you cannot run or execute the program because the main() function is the entry point, from where all the execution begins. And without the entry point, then you can execute the program.
std is a standard namespace in C++
The term polymorphism refers to the presence of multiple forms. Polymorphism usually occurs when there is a hierarchy of classes that are linked by inheritance.
C++ polymorphism means that depending on the type of object that invokes the function, a different function will be executed.
In this programming language to call a function we have 2 methods: Call by Value and Call by Reference
| Call by Value | Call by Reference |
| A copy of a variable is passed. | A variable itself is passed fundamentally. |
| Calling a function by sending the values by copying variables. | Calling a function by sending the address of the passed variable. |
| The changes made in the function are never reflected outside the function on the variable. In short, the original value is never altered in Call by Value. | The changes made in the functions can be seen outside the function on the passed function. In short, the original value is altered in Call by reference. |
| Function Overloading | Operator Overloading |
| It is basically defining a function in numerous ways such that there are many ways to call it or in simple terms you have multiple versions of the same function | It is basically giving practice of giving a special meaning |
Parameterized Functions are a good example of useful for different purposes | Polymorphism is a good example of an operator purposes |
When a function of the same name, same arguments or parameters, and same return type already present/declared in the base class is used in a derived class is known as Function Overriding. It is an example of Runtime Polymorphism or Late Binding which means the overridden function will be executed at the run time of the execution.
Virtual inheritance is a technique that ensures only one copy of a base class’s member variables is inherited by grandchild-derived classes. Or in simple terms, virtual inheritance is used when we are dealing with a situation of multiple inheritances but want to prevent multiple instances of the same class from appearing in the inheritance hierarchy./p>
A constructor is a special type of member function of a class, whose name is the same as that of the class by whom it is invoked and initializes value to the object of a class./p>
There are 3 types of constructors:
Destructors are members of functions in a class that delete an object when an object of the class goes out of scope. Destructors have the same name as the class preceded by a tilde (~) sign. Also, destructors follow a down-to-top approach, unlike constructors which follow a top-to-down.
The delete operator is used to delete/remove all the characteristics/properties from an object by deallocating its memory; furthermore, it returns true or false in the end. In simple terms, it destroys or deallocates array and non-array(pointer) objects which are created by new expressions.
A scope resolution operator is denoted by a ‘::‘ symbol. Just like its name this operator resolves the barrier of scope in a program. A scope resolution operator is used to reference a member function or a global variable out of their scope furthermore to which it can also access the concealed variable or function in a program.
Scope Resolution is used for numerous amounts of tasks:
The access restriction specified to the class members( whether it is member function or data member) is known as access modifiers/specifiers.
Access Modifiers are of 3 types:
A member function in the base class redefined in a derived class is a virtual function. It is declared using the virtual keyword. It ensures that the correct function is called for an object, irrespective of the type of reference/pointer used for the function call. Virtual functions are mainly used for runtime polymorphism.
Concepts of OOPs:
Object: Anything that exists physically in the real world is called an object.
Class: The collection of objects is called class.
Inheritance: Properties of parent class inherited into child class is known as inheritance.
Polymorphism: It is the ability to exist in more than one form.
Encapsulation: Binding of code and data together into a single unit.
Abstraction: Hiding internal details and showing functionality to the user.
An inline function when called expands in line. When you call this function, the whole code of the inline function gets inserted or substituted at the inline function call.
Syntax:
Inline return-type function-name(parameters)
{
}
A copy function is a member function that uses another object from the same class to initialize a new thing. A copy function is, to put it simply, a function that produces an object by initializing it with a different object of the same class that has already been constructed.
Inheritance is the mechanism in which you can create a new class i.e. child class from the existing class i.e. parent class. This child class is also known as a derived class and the parent class is also called Base class.
The delete operator is used to delete/remove all the characteristics/properties from an object by deallocating its memory; furthermore, it returns true or false in the end. In simple terms, it destroys or deallocates array and non-array(pointer) objects which are created by new expressions.
Namespaces enable us to organize named items that would otherwise have global scope into smaller scopes, allowing us to give them namespace scope. This permits program parts to be organized into distinct logical scopes with names. The namespace provides a place to define or declare identifiers such as variables, methods, and classes.
Or we could say that A namespace is a declarative zone that gives the identifiers (names of types, functions, variables, and so on) within it a scope. Namespaces are used to arrange code into logical categories and to avoid name clashes, which might happen when you have many libraries in your code base.
this pointer enables every object to have access to its own address through an essential pointer. All member functions take this pointer as an implicit argument. this pointer may be used to refer to the calling object within a member function. this pointer is used to pass an object as a parameter to another me.
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