Page 87 - DCAP404 _Object Oriented Programming

Object-oriented Programming

Notes integer int1, int2, int3;
int1.getdata(15);
int2.getdata(25);
cout<<“\n the value of x for object int1 “;
int1.disp();
cout<<“\n the value of x for object int2 “;
int2.disp(); .

cout<<“\n the sum of private data values of x belonging to objects int1 and
int2 is “;
int3 = int1.sum(int2);
int3.disp();
getche();
}
You should see the following output from the program.

the value of x for object int1 15
the value of x for object int2 25
the sum of private data values of x belonging to objects int1 and int2 is 40

Did u know? What is Returning a Reference to a const object?
Though the main reason for using const reference is efficiency, there are restrictions on
when this choice could be used. If a function returns an object that is passed to it, either by
object invocation or as a method argument, we can increase the efficiency of the method
by having it pass a reference.

Self Assessment

Fill in the blanks:
10. You can use a class type to create instances or ………………….. of that class type.

11. In C++, unlike C, you do not need to precede declarations of class objects with the keywords
union, struct, and class unless the ……………….. of the class is hidden.

4.4 Accessing a Member of Class

Member data items of a class can be static. Static data members are data objects that are common
to all objects of a class. They exist only once in all objects of this class. The static members are
used when the information is to be shared. They can be public or private data. The main advantage
of using a static member is to declare the global data which should be updated while the
program lives in memory.

When a static member is declared private, the non-member functions cannot access these
members. But a public static member can be accessed by any member of the class. The static data
member should be created and initialized before the main function control block begins.

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