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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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answers
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ch06_1.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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83 lines
// Chapter 6 - Programming exercise 1
#include <iostream.h>
#include <string.h>
class box {
int length;
int width;
char line_of_text[25];
public:
box(char *input_line); //Constructor
void set(int new_length, int new_width);
int get_area(void);
void change(char *new_text);
};
box::box(char *input_line) //Constructor implementation
{
length = 8;
width = 8;
strcpy(line_of_text, input_line);
}
// 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)
{
cout << line_of_text << "= ";
return (length * width);
}
void box::change(char *new_text)
{
strcpy(line_of_text, new_text);
}
main()
{
box *small, *medium, *large;
small = new box("small box ");
medium = new box("medium box ");
large = new box("large box ");
small->set(5, 7);
large->set(15, 20);
cout << "The area of the " << small->get_area() << "\n";
cout << "The area of the " << medium->get_area() << "\n";
cout << "The area of the " << large->get_area() << "\n";
small->change("first box ");
medium->change("second box ");
large->change("third box ");
cout << "The area of the " << small->get_area() << "\n";
cout << "The area of the " << medium->get_area() << "\n";
cout << "The area of the " << large->get_area() << "\n";
}
// Result of execution
//
// The area of the small box = 35
// The area is the medium box = 64
// The area is the large box = 300
// The area of the first box = 35
// The area is the second box = 64
// The area is the third box = 300