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The C Users' Group Library 1994 August
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wc-cdrom-cusersgrouplibrary-1994-08.iso
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vol_300
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353_02
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objlist.cpp
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C/C++ Source or Header
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1992-01-19
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2KB
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84 lines
// Chapter 6 - Program 5
#include <iostream.h>
class box {
int length;
int width;
box *another_box;
public:
box(void); //Constructor
void set(int new_length, int new_width);
int get_area(void);
void point_at_next(box *where_to_point);
box *get_next(void);
};
box::box(void) //Constructor implementation
{
length = 8;
width = 8;
another_box = NULL;
}
// This method will set a box size to the two input parameters
void box::set(int new_length, int new_width)
{
length = new_length;
width = new_width;
}
// This method will calculate and return the area of a box instance
int box::get_area(void)
{
return (length * width);
}
// This method causes the pointer to point to the input parameter
void box::point_at_next(box *where_to_point)
{
another_box = where_to_point;
}
// This method returns the box the current one points to
box *box::get_next(void)
{
return another_box;
}
main()
{
box small, medium, large; //Three boxes to work with
box *box_pointer; //A pointer to a box
small.set(5, 7);
large.set(15, 20);
cout << "The small box area is " << small.get_area() << "\n";
cout << "The medium box area is " << medium.get_area() << "\n";
cout << "The large box area is " << large.get_area() << "\n";
small.point_at_next(&medium);
medium.point_at_next(&large);
box_pointer = &small;
box_pointer = box_pointer->get_next();
cout << "The box pointed to has area " <<
box_pointer->get_area() << "\n";
}
// Result of execution
//
// The small box area is 35
// The medium box area is 64
// The large box area is 300
// The box pointed to has area 64