в 14:21, 25 мая 2010

2010-05-25T14:21:06Z

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2010-05-25T10:25:28Z

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==Assign the public object member address to a pointer==

<source lang="cpp">
#include <iostream>
using namespace std;
class MyClass {
public:
int i;
MyClass(int j) {
i = j;
}
};
int main()
{
MyClass myObject(1);
int *p;
p = &myObject.i; // get address of myObject.i
cout << *p; // access myObject.i via p
return 0;
}

</source>

==Class with only public fields and methods==

<source lang="cpp">
#include <iostream>
#include <string.h>
using namespace std;
class movie
{
public:
char name[64];
char first_star[64];
char second_star[64];
void show_movie(void);
void initialize(char *name, char *first, char *second);
};
void movie::show_movie(void)
{
cout << "Movie name: " << name << endl;
cout << "Starring: " << first_star << " and " << second_star << endl << endl;
}
void movie::initialize(char *movie_name, char *first, char *second)
{
strcpy(name, movie_name);
strcpy(first_star, first);
strcpy(second_star, second);
}
int main(void)
{
movie fugitive, sleepless;
fugitive.initialize("A", "F", "B");
sleepless.initialize("C", "D", "E");
cout << fugitive.name << " and " << sleepless.name << endl;
cout << fugitive.first_star << endl;
}

</source>

==field in struct is public by default==

<source lang="cpp">
#include <iostream>
#include <string.h>
using namespace std;
struct MyBook {
char title[64]; // Public by default
void show_book(void)
{
cout << "Book: " << title << " Price: $" << price ;
};

void set_price(float amount) { price = amount; };
void assign_title(char *name) { strcpy(title, name); };
private:
float price;
};
int main(void)
{
MyBook book;
book.assign_title("A");
book.set_price(49.95);
book.show_book();
}

</source>

==Illustrates the use of a public variable==

<source lang="cpp">
#include <iostream>
using namespace std;
class myclass {
public:
int i, j, k; // accessible to entire program
};
int main()
{
myclass a, b;
a.i = 100;
a.j = 4;
a.k = a.i * a.j;
b.k = 12;
cout << a.k << " " << b.k;
return 0;
}

</source>

==public class extending==

<source lang="cpp">
#include <iostream>
#include <string.h>
using namespace std;
class Book
{
public:
Book(char *title) { strcpy(Book::title, title); };
void show_title(void) { cout << title << endl; };
private:
char title[64];
};
class LibraryCard : public Book
{
public:
LibraryCard(char *title, char *author, char *publisher) : Book(title) {
strcpy(LibraryCard::author, author);
strcpy(LibraryCard::publisher, publisher);
};
void show_library(void) {
show_title();
cout << author << " " << publisher;
};
private:
char author[64];
char publisher[64];
};

int main(void)
{
LibraryCard card("A", "B", "C");
card.show_library();
}

</source>

==public data field==

<source lang="cpp">
#include <iostream>
using namespace std;
class Base
{
public:
Base(void) { cout << "Base class constructor\n"; };
int data;
};
class Derived:public Base
{
public:
Derived(void): Base()
{ cout << "Derived class constructor\n"; };
};
int main(void)
{
Derived object;
object.data = 5;
cout << object.data << endl;
}

</source>

==public inheritance from three parent classes==

<source lang="cpp">
#include <iostream>
using namespace std;
class One{
public:
One(void) { cout << "Constructor for One\n"; };
};
class Two{
public:
Two(void) { cout << "Constructor for Two\n"; };
};
class Three {
public:
Three(void) { cout << "Constructor for Three\n"; };
};
class Derived: public One, public Three, public Two
{
public:
Derived(void) : One(), Two(), Three()
{
cout << "Derived constructor called\n";
};
};
int main(void)
{
Derived my_class;
}

</source>

==Virtual public inheritance==

<source lang="cpp">
#include <iostream>
using namespace std;
class base
{
public:
int i;
};
class derived1 : virtual public base
{
public:
int j;
};
class derived2 : virtual public base
{
public:
int k;
};
class derived3 : public derived1, public derived2 {
public:
int sum;
};
int main(void)
{
derived3 object;
object.i = 10; // now i is unambiguous
object.j = 20;
object.k = 30;
object.sum = object.i + object.j + object.k;
cout << object.i << " ";
cout << object.j << " " << object.k << " ";
cout << object.sum << endl;
}

</source>

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