chapter12test3

Stock.h

#ifndef STOCK_H_

#define STOCK_H_

#include<iostream>

class Stock

{

private:
char *company;
int shares;
double share_val;
double total_val;
void settot(){ total_val = shares*share_val; }

public:
Stock();
Stock(const char *ch, long n = 0, double pr = 0);
~Stock();
void buy(long num, double price);
void sell(long num, double price);
void update(double price);
const Stock &top_val(const Stock &s)const;
friend std::ostream &operator<<(std::ostream &os, const Stock *s);
friend std::ostream &operator<<(std::ostream &os, Stock &s);

};

#endif

Stock.cpp

#include<iostream>

#include"Stock.h"

Stock::Stock()

{
company = new char[15];
strcpy_s(company,15,"no name");
shares = 0;
share_val = 0.0;
total_val = 0.0;

}

Stock::~Stock()

{
delete[]company;

}

Stock::Stock(const char *ch, long n, double pr)

{
company = new char[strlen(ch)+1];
strcpy_s(company,strlen(ch)+1,ch);
if (n < 0)
{
std::cout << "Shares cannot be negtive .\n";
shares = 0;
}
else
shares = n;
share_val = pr;
settot();

}

void Stock::buy(long num, double price)

{
if (num < 0)
std::cout << "You cannot buy shares less than 0.\n";
else
shares += num;
share_val = price;
settot();

}

void Stock::sell(long num, double price)

{
if (num < 0)
std::cout << "You cannot sell shares less than 0.\n";
else if (num>shares)
std::cout << "You don't have enougn stocks .\n";
else
{
shares -= num;
share_val = price;
settot();
}

}

void Stock::update(double price)

{
share_val = price;
settot();

}

const Stock &Stock::top_val(const Stock &s)const

{
if (total_val > s.total_val)
return *this;
else
return s;

}

std::ostream &operator<<(std::ostream &os, const Stock *s)

{
os << "Company :" << s->company << " ;Shares :"<<s->shares<< '\n';
os << "Share price :" << s->share_val << '\n';
os << "Total worth :$"<<s->total_val << '\n';
return os;
}

std::ostream &operator<<(std::ostream &os, Stock &s)

{
os << "Company :" << s.company << " ;Shares :" << s.shares << '\n';
os << "Share price :" << s.share_val << '\n';
os << "Total worth :$" << s.total_val << '\n';
return os;

}

user.cpp

#include<iostream>

#include"Stock.h"

const int STKS = 4;

using namespace std;

int main()

{
Stock stock[STKS] =
{ Stock("Nanosmart", 12, 20.0),
Stock("Boffo Objects", 200, 2.0),
Stock("Monolithic Obliskes", 130, 3.25),
Stock("Fleep Enterprices", 60, 6.5) };
cout << "Stock holding :\n";
int st;
for (st = 0; st < STKS; st++)
cout << stock[st];
const Stock *top = &stock[0];
for (st = 1; st < STKS; st++)
top = &top->top_val(stock[st]);
cout << "Most valuable holding :\n";
cout << top;
return 0;

}