kateolenya

#include "private_var.h"
#include <stdio.h>
#include <stdlib.h>

struct Contact
{
    int mobile_number;
    int home_number;
};

kateolenya

#ifndef PRIVATE_VAR
#define PRIVATE_VAR

struct Contact;

struct Contact * create_contact();
void delete_contact( struct Contact * some_contact );

#endif /* PRIVATE_VAR */

kateolenya

#include "private_var.h"
#include <stdio.h>

int main()
{
    struct Contact * Tony;
    Tony = create_contact();

    int * mobile_number_is_here = (int *)Tony;
    printf("Mobile number: %d\n", *mobile_number_is_here);

kateolenya

#include "private_funct.h"

int main()
{
    struct Contact * Tony;
    Tony = create_contact();
    // print_numbers( Tony );
    // will cause compile time error
    delete_contact( Tony );
    return 0;

kateolenya

#include "private_funct.h"
#include <stdio.h>
#include <stdlib.h>

struct Contact
{
    int mobile_number;
    int home_number;
};

kateolenya

#ifndef PRIVATE_FUNCT_H
#define PRIVATE_FUNCT_H

struct Contact;

struct Contact * create_contact();
static void print_numbers( struct Contact * some_contact );
void delete_contact( struct Contact * my_points );

#endif /* PRIVATE_FUNCT_H */

kateolenya

#include <iostream>
using namespace std;

class Device {
    public:
        int serial_number = 12345678;

        void turn_on() {
            cout << "Device is on" << endl;
        }

kateolenya

#include <iostream>
using namespace std;

class Device {
    public:
        int serial_number = 12345678;

        void turn_on() {
            cout << "Device is on" << endl;
        }

kateolenya

#include <iostream>
using namespace std;

class Device {
    public:
        // constructor
        Device() {
            cout << "Device constructor called" << endl;
        }
        // destructor

kateolenya

#include <iostream>
using namespace std;

class Device {
    public:
        void turn_on() {
            cout << "Device is on." << endl;
        }
};