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C/C++ Users Group Library 1996 July
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C-C++ Users Group Library July 1996.iso
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vol_300
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353_02
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objlink.cpp
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C/C++ Source or Header
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1992-01-18
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2KB
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103 lines
// Chapter 6 - Program 6
#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 that this one points to
box *box::get_next(void)
{
return another_box;
}
main()
{
box *start = NULL; // Always points to the start of the list
box *temp; // Working pointer
box *box_pointer; // Used for box creation
// Generate the list
for (int index = 0 ; index < 10 ; index++ ) {
box_pointer = new box;
box_pointer->set(index + 1, index + 3);
if (start == NULL)
start = box_pointer; // First element in list
else
temp->point_at_next(box_pointer); // Additional element
temp = box_pointer;
}
// Print the list out
temp = start;
do {
cout << "The area is " << temp->get_area() << "\n";
temp = temp->get_next();
} while (temp != NULL);
// Delete the list
temp = start;
do {
temp = temp->get_next();
delete start;
start = temp;
} while (temp != NULL);
}
// Result of execution
//
// The area is 3
// The area is 8
// The area is 15
// The area is 24
// The area is 35
// The area is 48
// The area is 63
// The area is 80
// The area is 99
// The area is 120