Помогите, простое задание. Про с ++.Нужно создать класс. Называется сотовый телефон.

class CellPhone
{

public:

CellPhone( const char*, double, const char* );

private:

char* m_firm;

char* m_os;

double m_price;

CellPhone();

};

class CellPhone {
public:
CellPhone(const string& vendor, double price, const string& os):
vendor_(vendor), price_(price), os_(os) {}

// auto-generated deletion, copying and moving are OK
private:
string vendor_;
double price_;
string os_;
} iPhone("Apple", 30000, "iOS");

#include
using namespace std;

class CellPhone
{
public:
void setFirm(char a[]) { strcpy(firm,a); }
char* getFirm(){return firm;}
void setPrice(float b) { price = b; }
float getPrice() { return price; }
void setSystem(char a[]) { strcpy(system,a); }
char* getSystem(){return system;}
private:
char firm[20];
float price;
char system[20];
};

int main(){

CellPhone iPhone;

iPhone.setFirm("Apple");
cout << "Firm of phone is " << iPhone.getFirm() << endl;
iPhone.setPrice(30000.00);
cout << "His price is " << iPhone.getPrice() << endl;
iPhone.setSystem("Mac");
cout << "System of phone is " << iPhone.getSystem() << endl;

system("pause > nul");
return 0;
}