/* bkClass.cpp by detour@metalshell.com
 *
 * Very basic example of a class
 *
 * http://www.metalshell.com/
 *
 */
 
#include <string>
#include <iostream>
 
class Book {
    /* Private members of a class can never be altered
       by anything but functions of the class. The data
       is considered hidden. */
    private:
        int pages;
        char ISBN[14];
    /* All the functions needed to be called from outside
       the class are declared as public. */
    public:
        /* Becuase only functions in the class can modify the
           data you need to have set functions.  Always perform
           your checks for valid data in these functions. */
        void setISBN(char *nISBN) {
            if(strlen(nISBN) < 14)
                strcpy(ISBN, nISBN);
        }
        void setPages(int npages) {
            pages = npages;
        }
        /* A print out of the data */
        void displayData() {
            cout << "*******  Book  *******\n";
            cout << "* ISBN:  " << ISBN << endl;
            cout << "* Pages: " << pages << endl;
            cout << "**********************\n";
        }
};
 
int main() {
    Book myBook;
 
    myBook.setISBN("0-671-04191-6");
    myBook.setPages(296);
    myBook.displayData();
 
    /* These would not work becuase you can not read or
       modified private data */
    // cout << myBook.ISBN;
    // pages = 500;
 
    return 0;
}