C++ Primer Plus 第十章书上源码
记录我看C++ Primer Plus(第六版)第十章源代码
10.1
//10.1
#ifndef STOCK00_H_
#define STOCK00_H_
#include<string>
class Stock
{
private:
std::string company;
long shares;
double share_val;
double total_val;
void set_tot() { total_val = shares * share_val; }
public:
void acquire(const std::string &co, long n, double pr);
void buy(long num, double price);
void sell(long num, double price);
void update(double price);
void show();
};
#endif
10.2
//10.2
#include<iostream>
#include"stock00.h"
void Stock::acquire(const std::string &co, long n, double pr)
{
company = co;
if(n<0)
{
std::cout << "Number of shares can't be negative;"
<< company << " shares set to 0.\n";
shares = 0;
}
else
shares = n;
share_val = pr;
set_tot();
}
void Stock::buy(long num, double price)
{
if(num<0)
{
std::cout << "Number of shares purchased can't be negative. "
<< "Transaction is aborted.\n";
}
else
{
shares += num;
share_val = price;
set_tot();
}
}
void Stock::sell(long num, double price)
{
using std::cout;
if(num<0)
{
cout << "Number of shares sold can't be negative."
<< "Transaction is aborted.\n";
}
else if(num>shares)
{
cout << "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()
{
std::cout << "Company: " << company
<< " Shares: " << shares << "\n"
<< " Shar Price: $" << share_val
<< " Total Worth: $" << total_val << "\n";
}
10.3
#include<iostream>
#include"stock00.cpp"
int main()
{
Stock fluffy_the_cat;
fluffy_the_cat.acquire("NanoSmart", 20, 12.50);
fluffy_the_cat.show();
fluffy_the_cat.buy(15, 18.125);
fluffy_the_cat.show();
fluffy_the_cat.sell(400, 20.00);
fluffy_the_cat.show();
fluffy_the_cat.buy(300000,40.125);
fluffy_the_cat.show();
fluffy_the_cat.sell(300000, 0.125);
fluffy_the_cat.show();
return 0;
}
10.4
//10.4
#ifndef STOCK10_H_
#define STOCK10_H_
#include<string>
class Stock
{
private:
std::string company;
long shares;
double share_val;
double total_val;
void set_tot() { total_val = shares * share_val; }
public:
Stock();
Stock(const std::string &co, long n = 0, double pr = 0.0);
~Stock();
void buy(long num, double price);
void sell(long num, double price);
void update(double price);
void show();
};
#endif
10.5
//10.5
#include<iostream>
#include"stock10.h"
Stock::Stock()
{
std::cout << "Default constructor called\n";
company = "no name";
shares = 0;
share_val = 0.0;
total_val = 0.0;
}
Stock::Stock(const std::string &co, long n , double pr )
{
std::cout << "Constructor using " << co << " called\n";
company = co;
if(n<0)
{
std::cout << "Number of shares can't be negative; "
<< company << " shares set to 0.\n";
shares = 0;
}
else
shares = n;
share_val = pr;
set_tot();
}
Stock::~Stock()
{
std::cout << "Bye, " << company << "!\n";
}
void Stock::buy(long num, double price)
{
if(num<0)
{
std::cout << "Number of shares purchased can't be negative. "
<< "Transaction is aborted.\n";
}
else
{
shares += num;
share_val = price;
set_tot();
}
}
void Stock::sell(long num, double price)
{
using std::cout;
if(num<0)
{
cout << "Number of shares sold can't be negative. "
<< "Transaction is aborted.\n";
}
else if(num>shares)
{
cout << "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::ios_base;
ios_base::fmtflags orig =
cout.setf(ios_base::fixed, ios_base::floatfield);
std::streamsize prec = cout.precision(3);
cout << "Company: " << company
<< " Shares: " << shares << "\n";
cout << " Share Price: $" << share_val;
cout.precision(2);
cout << " Total Worth: $" << total_val << "\n";
cout.setf(orig, ios_base::floatfield);
cout.precision(prec);
}
10.6
#include<iostream>
#include"stock10.cpp"
int main()
{
{
using std::cout;
cout << "Using constructors to create new objects\n";
Stock stock1("NanoSmart", 12, 20.0);
stock1.show();
Stock stock2 = Stock("Boffo Objects", 2, 2.0);
stock2.show();
cout << "Assigning stock1 to stock2:\n";
stock2 = stock1;
cout << "Listing stock1 and stock:\n";
stock1.show();
stock2.show();
cout << "Using a constructor to reset an object\n";
stock1 = Stock("Nifty Foods", 10, 50.0);
cout << "Revised stock1:\n";
stock1.show();
cout << "Done\n";
}
return 0;
}
10.7
//10.7
#ifndef STOCK20_H_
#define STOCK20_H_
#include<string>
class Stock
{
private:
std::string company;
int shares;
double share_val;
double total_val;
void set_tot(){
total_val = shares * share_val;
}
public:
Stock();
Stock(const std::string &co, long n = 0, double pr = 0.0);
~Stock();
void buy(long num, double price);
void sell(long num, double price);
void update(double price);
void show() const;
const Stock &topval(const Stock &s) const;
};
#endif
10.8
//10.8
#include<iostream>
#include"stock20.h"
Stock::Stock()
{
company = "no name";
shares = 0;
share_val = 0.0;
total_val = 0.0;
}
Stock::Stock(const std::string &co, long n , double pr )
{
company = co;
if(n<0)
{
std::cout << "Number of shares can't be negative; "
<< company << " shares set to 0.\n";
shares = 0;
}
else
shares = n;
share_val = pr;
set_tot();
}
Stock::~Stock()
{
}
void Stock::buy(long num, double price)
{
if(num<0)
{
std::cout << "Number of shares purchased can't be negative. "
<< "Transaction is abotted.\n";
}
else
{
shares += num;
share_val = price;
set_tot();
}
}
void Stock::sell(long num, double price)
{
using std::cout;
if(num<0)
{
cout << "Number of shares sold can't be negative. "
<< "Transaction is aborted.\n";
}
else if(num>shares)
{
cout << "You can't sell more than you have! "
<< "Transation is aborted.\n";
}
else
{
shares -= num;
share_val = price;
set_tot();
}
}
void Stock::update(double price)
{
share_val = price;
set_tot();
}
void Stock::show() const
{
using std::cout;
using std::ios_base;
ios_base::fmtflags orig =
cout.setf(ios_base::fixed, ios_base::floatfield);
std::streamsize prec = cout.precision(3);
cout << "Company: " << company
<< " Shares: " << shares << "\n";
cout << " Share Price: $" << share_val;
cout.precision(2);
cout << " Total Worth: $" << total_val << "\n";
cout.setf(orig, ios_base::floatfield);
cout.precision(prec);
}
const Stock&Stock::topval(const Stock &s) const
{
if(s.total_val>total_val)
return s;
else
return *this;
}
10.9
#include<iostream>
#include"stock20.cpp"
const int STKS = 4;
int main()
{
Stock stocks[STKS] = {
Stock("NanoSmart", 12, 20.0),
Stock("Boffo Objects", 200, 2.0),
Stock("Monolithic Obelisks", 130, 3.25),
Stock("Fleep Enterprisee", 60, 6.5)};
std::cout << "Stock holdings:\n";
int st;
for (st = 0; st < STKS;st++)
stocks[st].show();
const Stock*top=&stocks[0];
for (st = 1; st < STKS;st++)
top = &top->topval(stocks[st]);
std::cout << "\nMost valuable holding:\n";
top->show();
return 0;
}
10.10
//10.10
#ifndef STACK_H_
#define STACK_H_
typedef unsigned long Item;
class Stack
{
private:
enum
{
MAX = 10
};
Item items[MAX];
int top;
public:
Stack();
bool isempty() const;
bool isfull() const;
bool push(const Item &item);
bool pop(Item &item);
};
#endif
10.11
//10.11
#include"stack.h"
Stack::Stack()
{
top = 0;
}
bool Stack::isempty() const
{
return top == 0;
}
bool Stack::isfull() const
{
return top == MAX;
}
bool Stack::push(const Item &item)
{
if(top<MAX)
{
items[top++] = item;
return true;
}
else
return false;
}
bool Stack::pop(Item &item)
{
if(top>0)
{
item = items[--top];
return true;
}
else
return false;
}
10.12
#include<iostream>
#include<cctype>ss
#include"stack.cpp"
int main()
{
using namespace std;
Stack st;
char ch;
unsigned long po;
cout << "Please enter A to add a purchase order,\n"
<< "P to process aPO, or Q to quit.\n";
while(cin>>ch&&toupper(ch!='Q'))
{
while(cin.get()!='\n')
continue;
if(!isalpha(ch))
{
cout << '\a';
continue;
}
switch(ch)
{
case'A':
case'a':
cout << "Enter a PO number to add: ";
cin >> po;
if(st.isfull())
cout << "stack already full\n";
else
st.push(po);
break;
case'p':
case'P':
if(st.isempty())
cout << "stack already empty\n";
else
{
st.pop(po);
cout << "PO #" << po << " popped\n";
}
break;
}
cout << "Please enter A to add a purchase order,\n"
<< "P to process aPO, or Q to quit.\n";
}
cout << "Bye\n";
return 0;
}