Answer Posted / 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.

How are variables declared in c?

1146

---

What is the use of typedef in structure in c?

1007

---

Can you please explain the difference between strcpy() and memcpy() function?

1118

---

Why doesnt that code work?

1271

---

please send me the code for multiplying sparse matrix using c

2220

---

What is the purpose of main( ) in c language?

1184

---

What is this infamous null pointer, anyway?

1100

---

Can we declare a function inside a function in c?

1094

---

How do shell structures work?

1171

---

#define f(g,h) g##h main O int i=0 int var=100 ; print f ("%d"f(var,10));} wat would be the output??

2010

---

the process of defining something in terms of itself is called (or) in C it is possible for the functions to call themselves. A function called a) nested function b) void function c) recursive function d) indifinite function

1368

---

What are local static variables?

1204

---

Explain how can I remove the trailing spaces from a string?

1101

---

What is gets() function?

1186

---

What are terms in math?

1097

---