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Instances in OOP

In object-oriented programming (OOP), instances of a class are also referred to as objects. Objects are created based on a class definition, and each object represents a unique instance of that class.

1. Class Definition:

  • A class is a blueprint or template that defines the structure and behavior of objects.
  • It encapsulates data (attributes) and functions (methods) that operate on that data.
// Class definition
class MyClass {
    // Member function to set the value of the member variable
    void setValue(int val) {
        myValue = val;

    // Member function to get the value of the member variable
    int getValue() {
        return myValue;

    // Private member variable
    int myValue;

2. Creating Instances (Objects):

  • Objects are instances of a class. They represent specific entities based on the class blueprint.
  • You create an object by declaring a variable of the class type.
// Creating instances (objects) of MyClass
MyClass obj1;  // obj1 is an object of MyClass
MyClass obj2;  // obj2 is another object of MyClass

3. Manipulating Objects:

  • Objects have their own set of member variables and can be manipulated using member functions.
// Setting values for obj1 and obj2

// Retrieving values from obj1 and obj2
int value1 = obj1.getValue();
int value2 = obj2.getValue();

4. Independence of Objects:

  • Each object created from the same class is independent of others.
  • Changes to one object do not affect the state of other objects.
// obj1 and obj2 have independent states
std::cout << "Value of obj1: " << value1 << std::endl;
std::cout << "Value of obj2: " << value2 << std::endl;
Categories OOP