Object-Oriented Programming : Object and classes

 

C++ have various type of datatype like integer ,double ,char that are not sufficient some time to solving real-time problem. Real-life problem is not just adding two integer together or string it’s really very complex. Just think about you are going to ATM to withdrawal some cash. This is practical example where programming really make changes.

While studying programming object is most often use keyword .What is really object is. Your computer is an object or your mobile is also a kind of object. In Programing terms we can say “An object is combination of data and operation performed in same object”. Ex- Your mobile phone has ram, camera and other things, and you have function in your phone to operate these things. In any programing concept when, data or we can say attribute are combine with operation (methods) is known as class. The class is also called a new user defined type datatype. Struct concept of C is same as class.

 The syntax for class

class name_of_class  
//class declaration {
Class attribute and members
};// Do not forget the semicolon here 

Error identification “If you miss semicolon while defining class this tends to show error”

Member Function

In class member function is called methods. Its same as normal function just define inside class. Definition of class can be inside or outside its really does not matter.

Class syntax with member function

class name_of_class
{Private:
int attribute1;
public:
    void method_1(){       //code inside method_1}
};

Member function of class will be private or public depends on the nature of method. The member need to be accessed outside are declared public, and that is not freely accessed are defined private.

Note

If method definition are outside to class boundary then use :: (scope-operator).If definition is inside we do not need this operator.