Answer / yuva

You use virtual functions when you want to override a
certain behavior(read method) for your derived class than
the one implemented for the Base class and you want to do so
at run-time through an pointer to Base class.

The classical example is when you have a base class called
Shape and concrete shapes(classes) which derive from it.
Each concrete class overrirdes(implements a virtual method)
called Draw().

The class hierarchy as follows:

Class hierarchy

The following snippet shows the usage of the example, it
creates an array of Shape class pointers wherein each points
to distinct derived class object. At run-time invoking
Draw() method results in calling of the method overriden by
that derived class and the particular Shape is drawn(rather
rendered).

Shape *basep[] = { &line_obj, &tri_obj,
&rect_obj, &cir_obj};
for (i = 0; i < NO_PICTURES; i++)
basep[i] -> Draw ();

The above program just uses the pointer to the Base class
storing addresses of the Derived class objects provides a
loose coupling in the way that the program does not have to
change drastically if a new concrete derived class of shape
is added anytime because the are minimal code segments which
actually use(depend) on the concrete Shape type.

The above is a good example of Open Closed Principle of the
famous SOLID design principles.

Explain what is a static function?

0 Answers  

---

What are Macros? What are its advantages and disadvantages?

0 Answers   TCS,

---

ratio,age,persentage

0 Answers  

---

program that accepts amount in figures and print that in words

2 Answers   Infosys, Lovely Professional University, Wipro,

---

can any one please explain, how can i access hard disk(physical address)? it is possible by the use of far,near or huge pointer? if yes then please explain......

0 Answers  

---

How pointers are declared?

0 Answers  

---

What is a static function in c?

0 Answers  

---

How can you increase the size of a statically allocated array?

0 Answers   TISL,

---

logic for generating all the combinations of the any number of given letters. ex::::::::: if a,b,c,d are given the o/p should be abcd,dcba,dbac,bcad,................ 4*3*2*1 combinations............

2 Answers   Infosys,

---

What is uint8 in c?

0 Answers  

---

What are the application of c?

0 Answers  

---

struct node {struct node*temp,*new} prinf("%d",sizeof(struct node));

2 Answers  

---