home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
C & C++ Multimedia Cyber Classroom
/
C and C++ Multimedia Cyber Classroom (Prentice Hall) (1998).iso
/
src
/
fig10_02.jar
/
Ch10
/
Fig10_02
/
Fig10_02.cpp
< prev
next >
Wrap
C/C++ Source or Header
|
1997-11-09
|
3KB
|
85 lines
// Fig. 10.2: fig10_02.cpp
// Driver for shape, point, circle, cylinder hierarchy
#include <iostream.h>
#include <iomanip.h>
#include "shape.h"
#include "point1.h"
#include "circle1.h"
#include "cylindr1.h"
void virtualViaPointer( const Shape * );
void virtualViaReference( const Shape & );
int main()
{
cout << setiosflags( ios::fixed | ios::showpoint )
<< setprecision( 2 );
Point point( 7, 11 ); // create a Point
Circle circle( 3.5, 22, 8 ); // create a Circle
Cylinder cylinder( 10, 3.3, 10, 10 ); // create a Cylinder
point.printShapeName(); // static binding
point.print(); // static binding
cout << '\n';
circle.printShapeName(); // static binding
circle.print(); // static binding
cout << '\n';
cylinder.printShapeName(); // static binding
cylinder.print(); // static binding
cout << "\n\n";
Shape *arrayOfShapes[ 3 ]; // array of base-class pointers
// aim arrayOfShapes[0] at derived-class Point object
arrayOfShapes[ 0 ] = &point;
// aim arrayOfShapes[1] at derived-class Circle object
arrayOfShapes[ 1 ] = &circle;
// aim arrayOfShapes[2] at derived-class Cylinder object
arrayOfShapes[ 2 ] = &cylinder;
// Loop through arrayOfShapes and call virtualViaPointer
// to print the shape name, attributes, area, and volume
// of each object using dynamic binding.
cout << "Virtual function calls made off "
<< "base-class pointers\n";
for ( int i = 0; i < 3; i++ )
virtualViaPointer( arrayOfShapes[ i ] );
// Loop through arrayOfShapes and call virtualViaReference
// to print the shape name, attributes, area, and volume
// of each object using dynamic binding.
cout << "Virtual function calls made off "
<< "base-class references\n";
for ( int j = 0; j < 3; j++ )
virtualViaReference( *arrayOfShapes[ j ] );
return 0;
}
// Make virtual function calls off a base-class pointer
// using dynamic binding.
void virtualViaPointer( const Shape *baseClassPtr )
{
baseClassPtr->printShapeName();
baseClassPtr->print();
cout << "\nArea = " << baseClassPtr->area()
<< "\nVolume = " << baseClassPtr->volume() << "\n\n";
}
// Make virtual function calls off a base-class reference
// using dynamic binding.
void virtualViaReference( const Shape &baseClassRef )
{
baseClassRef.printShapeName();
baseClassRef.print();
cout << "\nArea = " << baseClassRef.area()
<< "\nVolume = " << baseClassRef.volume() << "\n\n";
}