Introducing Classes

A class defines a new data type.
A class is a template for an object, and an object is an instance of a class.
Class has data and the code that operates on that data.
A class is declared by use of the class keyword.

The general form of a class definition is shown here:


class classname { 
  type instance-variable1; 
  type instance-variable2; 
  // ... 
  type instance-variableN; 


  type methodname1(parameter-list) { 
    // body of method 
  } 
  type methodname2(parameter-list) { 
    // body of method 
  } 
  // ... 
  type methodnameN(parameter-list) { 
   // body of method 
  } 
}
The data defined within a class are called instance variables.
Each object of the class contains its own copy of the instance variables.
The methods and variables defined within a class are called members of the class.
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