Polymorphism and Virtual Functions

spatlou

WHAT IS THE DIFFERENCE BETWEEN ASSIGNMENT AND INITIALIZATION (IN C++)?

nehachauhan015

If we have the overloading function of assignment operator present already , then

copy constructor is invoked when a new object is created from, an already existing object as a copy of it , as happened in Distance d2=d1 in below eg.

assignment operator is called when already assigned object is initialized with a new value from already existing object as happened in d3=d1 in below eg.

eg we have a class as:class Distance

{

public:

Distance()

{

cout<<"Zero arg constructor"<<endl;

}

Distance(const Distance &d)

{

cout<<"copy constructor invoked"<<endl;

}

Distance& operator =(const Distance &d)

{

cout<<"assignment operator invoked"<<endl;

}

};

int main()

{

Distance d1, d3;

Distance d2=d1;// copy constructor invoked

d3=d1;// assignment overloading happens

return 0;

}

dhananjay.patel

Variable Assignment:

After defining a variable, in next line we can give it a value using = operator. This process is called assignment.

Example:

#include<iostream>

using namespace std;

int main()

{

int age;

age = 25;

cout << "Age = " << age << endl;

return 0;

}

Variable Initialization

When the variable is defined we can provide it the initial value at the same time using = operator. This is called initialization.

Example:

#include<iostream>

using namespace std;

int main()

{

int age = 25;

cout << "Age = " << age << endl;

return 0;

}

abhisheksingh.tomar28

The concept is with reference to class.

Initialization

Initialization is giving value at time of object decelearation. so when we declare object try to supply value then this is Initialization

example

class_name obj1=25;

In C++, during Initialization if value is given then 1 argument constructor will be called and value will be supplied as argument.

example

class_name obj1=obj2;

NOW copy constructor will be called if object given as argument.

Assignment

Assignment is done when object is already created. Then operator overloading of assignment(=) is called in case of class.

ayushdhiman117

kya polymorphism function . me object parameter bhe pass kraa sakte hai. jaisa ke data type argument paas karate hai.

deepak4u106

Yes

mdaliakbar

After a variable has been defined, you can give it a value using the = operator. This process is called assignment, and the = operator is called the assignment operator.
Eg int a;
a=10;

Initialization
Is me two step combined hota hai.

Eg int width { 5 };

Polymorphism and Virtual Functions

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