stock1.cpp

我学习C++ Primer Plus过程中写下的课后作业的编程代码

//stock1.cpp -- Stock class implementation with constructors,destructor added
#include <iostream>
#include "stock1.h"

// constructors (verbose versions)
Stock::Stock()		//default constructor
{
	std::cout<<"Default constructor called\n";
	strcpy(company,"no name");
	shares = 0;
	share_val = 0.0;
	total_val = 0.0;
}

Stock::Stock(const char * co, int n, double pr)
{
	std::cout<<"Constructor using "<<co<<"called\n";
	strncpy(company,co,29);
	company[29]='\0';

	if (n<0)
	{
		std::cerr<<"Number of shares can't be negative;"
			<<company<<"shares set to 0.\n";
		shares = 0;
	}
	else
		shares = n;
	share_val = pr;
	set_tot();
}
//class destructor
Stock::~Stock()		//verbose class destructor
{
	std::cout<<"Bye,"<<company<<"!\n";
}

//other methods
void Stock::buy(int num,double price)
{
	if (num<0)
	{
		std::cerr<<"Number of shares purchased can't be negative."
			<<"Transaction is aborted.\n";
	}
	else
	{
		shares +=num;
		share_val=price;
		set_tot();
	}
}
void Stock::sell(int num,double price)
{
	using std::cerr;
	if(num<0)
	{
		cerr<<"Number of shares sold can't be negative."
			<<"Transaction is aborted.\n";
	}
		else if (num>shares)
		{
			cerr<<"You can't sell more than you have!"
				<<"Transaction is aborted.\n";
		}
		else
		{
			shares -= num;
			share_val = price;
			set_tot();
		}
	}
	void Stock::update(double price)
	{
		share_val = price;
		set_tot();
	}

	void Stock::show()
	{
		using std::cout;
		using std::endl;
		cout<<"Company:"<<company
			<<"Shares:"<<shares<<endl
			<<"Share Price:$"<<share_val
			<<"Total Worth:$"<<total_val<<endl;
	}