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//
Example of virtual function
//
Prithwiraj Shome
#
include
<
iostream
>
using
namespace
std
;
typedef
enum
area_type {
CIRCLE_AREA
,
RECTANGLE_AREA
,
UNKNOWN
}
AREA_TYPE
;
//
Base class
typedef
class
Shape
{
protected:
AREA_TYPE
type =
UNKNOWN
;
double
height =
0
;
double
width =
0
;
double
radius =
0
;
const
double
pi =
3.14
;
public:
Shape
() {};
Shape
(
double
h,
double
w,
double
r)
{
height = h;
width = w;
radius = r;
}
void
setType
(
AREA_TYPE
t)
{
type = t;
}
virtual
void
show
()
//
Virtual function but not Pure
{
if
(type ==
RECTANGLE_AREA
) {
cout <<
"
Height =
"
<< height << endl;
cout <<
"
Width =
"
<< width << endl;
}
else
if
(type ==
CIRCLE_AREA
) {
cout <<
"
Radius =
"
<< radius << endl;
}
}
//
Virtual Function
virtual
double
area
(
void
)
//
Virtual function but not Pure
{
if
(type ==
RECTANGLE_AREA
)
{
cout <<
"
Base Class Rectangle Area :
"
;
return
(height * width);
}
else
if
(type ==
CIRCLE_AREA
)
{
cout <<
"
Base Class Circle Area :
"
;
return
(pi * radius * radius);
}
else
{
cout <<
"
Base Class Area Error:
"
;
return
0
;
}
}
}
SHAPE
;
typedef
class
Rectangle
:
public
SHAPE
{
public:
Rectangle
(
double
h,
double
w)
{
height = h;
width = w;
}
double
area
(
void
)
{
return
(height * width);
}
void
show
()
{
cout <<
"
Rectangle Height =
"
<< height << endl;
cout <<
"
Rectangle Width =
"
<< width << endl;
}
}
RECTANGLE
;
typedef
class
Circle
:
public
SHAPE
{
public:
Circle
(
double
r)
{
radius = r;
}
double
area
(
void
)
{
return
(pi * radius * radius);
}
void
show
()
{
cout <<
"
Circle Radius =
"
<< radius << endl;
}
}
CIRCLE
;
int
main
(
void
)
{
SHAPE
* rPtr =
new
RECTANGLE
(
3
,
4
);
rPtr->
show
();
cout <<
"
Rectangle area is =
"
<< rPtr->
area
() <<
"
unit square
"
<< endl;
SHAPE
* cPtr =
new
CIRCLE
(
1
);
cPtr->
show
();
cout <<
"
Circle Area is =
"
<< cPtr->
area
() <<
"
unit square
"
<< endl;
SHAPE
* basePtr =
new
SHAPE
(
2
,
3
,
4
);
basePtr->
setType
(
CIRCLE_AREA
);
basePtr->
show
();
cout << basePtr->
area
() << endl;
basePtr->
setType
(
RECTANGLE_AREA
);
basePtr->
show
();
cout << basePtr->
area
() << endl;
}
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