What is class and object C?

The class is defined in two different sections namely @interface and @implementation . Almost everything is in form of objects. Objects receive messages and objects are often referred as receivers. Objects contain instance variables. Objects and instance variables have scope.

Read more

What is the use of classes?

The class is a blueprint that defines a nature of a future object. An instance is a specific object created from a particular class. Classes are used to create and manage new objects and support inheritance —a key ingredient in object-oriented programming and a mechanism of reusing code.

Read more