第十章 編程練習

編程練習1

//account.h
#ifndef ACCOUNT_H_
#define ACCOUNT_H_

#include <string>
using std::string;

class Account 
{
private:
    string fullname;
    string ID;
    double deposit;
public:
    Account(string, string, double);
    ~Account();
    void show();
    void add(double);
    void withdraw(double);
};
#endif

//account.cpp
#include "account.h"
#include <iostream>


Account::Account(string sname, string sID, double de)
{
    fullname = sname;
    ID = sID;
    deposit = de;
}

Account::~Account()
{
}
void Account::show()
{
    using std::cout;
    using std::endl;
    cout << "User's name is: " << fullname << endl;
    cout << "User's ID is: " << ID << endl;
    cout << "User's deposit is: " << deposit << endl;
}

void Account::add(double addmoney) 
{
    using std::cout;
    using std::endl;
    deposit += addmoney;
    cout << "The user has added " << addmoney << " to this account" << endl;
    cout << "Now the user's deposit is " << deposit << endl;
}
void Account::withdraw(double withdrawmoney)
{
    using std::cout;
    using std::endl;
    if (withdrawmoney <= deposit)
    {
        deposit -= withdrawmoney;
        cout << "The user has withdrawn " << withdrawmoney << " to this account" << endl;
        cout << "Now the user's deposit is " << deposit << endl;
    }
    else
    {
        cout << "The user doesn't have enough deposit!" << endl;
    }
}

//main.cpp
#include "account.h"


int main()
{

    Account account1("James Bond", "JB007", 2500);
    account1.show();

    account1.add(372.5);
    account1.withdraw(123.4);

    system("pause");

    return 0;
}

編程練習2

//Person.h
#ifndef PERSON_H_
#define PERSON_H_

#include <string>
class Person
{
private:
    static const int LIMIT = 25;
    std::string lname;
    char fname[LIMIT];
public:
    Person();
    Person(const std::string &ln, const char *fn = "Heyyou");
    ~Person();
    void Show() const;
    void FormalShow() const;
};

#endif

//Person.cpp
#include <string>
#include <iostream>
#include "Person.h"

    //Person(const std::string &ln, const char *fn = "Heyyou");
    //~Person();
    //void Show() const;
    //void FormalShow() const;

Person::Person()
{
    lname = "";
    fname[0] = '\0';
}

Person::Person(const std::string &ln, const char *fn)
{
    lname = ln;
    int i;
    for(i=0;i!=strlen(fn);i++)
        fname[i]=*(fn+i);
    fname[i] = '\0';
}

Person::~Person()
{
}

void Person::Show() const
{
    std:: cout << "This Person's firsname: " << fname
        << ", and his last name is: " << lname <<"\n";
}

void Person::FormalShow() const
{
    std:: cout << "This Person's lastname: " << lname 
        << ", and his first name is: " << fname <<"\n";
}

//main.cpp
#include "Person.h"

int main()
{
    Person one;
    Person two("Smythecraft");
    Person three("Dimwiddy","Sam");

    one.Show();
    one.FormalShow();
    two.Show();
    two.FormalShow();
    three.Show();
    three.FormalShow();

    system("pause");
    return 0;
}

編程練習3

//golf.h
#ifndef GOLF_H_
#define GOLF_H_

const int LEN = 40;
class golf
{
private:
    char fullname[LEN];
    int handicap;
public:
    golf(char *, int);
    golf();
    ~golf();
    void sethandicap(int);
    void showgolf();
};
#endif

//golf.cpp
#include "golf.h"
#include <cstring>
#include <iostream>
using namespace std;

golf::golf(char *n, int h)
{
    strcpy(fullname, n);
    handicap = h;
}

golf::golf()
{
    cout << "using intereactive method to creat a golf object" << endl;
    char name[LEN];
    int h;
    cout << "Please input the fullname" << endl;
    if (cin.get(name, LEN))
    {
        cin.get();
        cout << "Please enter the number of handicap (must be integer): ";      
        cin >> h;
        cin.get();
    }
    golf gtem(name, h);
    *this  = gtem;
}

golf::~golf()
{
}

void golf::sethandicap(int h)
{
    handicap = h;
}

void golf::showgolf()
{
    cout << fullname << " has " << handicap <<" times of handicap" << endl;
}

//main.cpp
#include "golf.h"
#include <iostream>;


int main()
{
    golf golf1("Li Lei", 10);
    golf golf2;

    golf1.showgolf();
    golf2.showgolf();

    golf1.sethandicap(5);
    golf1.showgolf();

    system("pause");
    return 0;
}

編程練習4

//sales.h
#ifndef SALES_H_
#define SALES_H_
const int QUARTERS = 4;

class Sales
{
private:
    double sales[QUARTERS];
    double average;
    double max;
    double min;
public:
    Sales(double *s);
    ~Sales(void);
    void setSales();
    void showSales();
};
#endif

//sales.cpp
#include "Sales.h"
#include <iostream>

using namespace std;

Sales::Sales(double *s)
{
    sales[0] = s[0];
    double total = sales[0];
    max = sales[0];
    min = sales[0];
    int i;
    for (i = 1; i < QUARTERS && s[i]>0; i++)
    {

        sales[i] = s[i];
        total += sales[i];
        if(max < sales[i])
            max = sales[i];
        if(min > sales[i])
            min = sales[i];
    }
    average = total/i;
}


Sales::~Sales()
{
}

void Sales::setSales()
{
    double total = 0;
    for (int i = 0; i < QUARTERS; i++)
    {
        cout << "Please enter the sales for Quater " << i+1 << " : ";
        cin >> sales[i];
        if (i == 0)
        { 
            max = sales[i];
            min = sales[i];
        }
        else {
            if (max < sales[i])
                max = sales[i];
            if (min > sales[i])
                min = sales[i];
        }
        total += sales[i];
    }
    average = total/QUARTERS;
}
void Sales::showSales()
{
    for (int i = 0; i < QUARTERS; i++)
        {
            if (sales[i] >0)
            cout << "The sales for Quater " << i+1 << " is  " << sales[i] << endl;
        }
        cout << "The max sales is  " << max<< endl;
        cout << "The min sales is  " << min<< endl;
        cout << "The average sales is  " << average<< endl;
}

//main.cpp
#include "sales.h"
#include <iostream>

int main()
{
    double d[] = {1000,2000,3000};
    Sales s1(d);

    s1.showSales();
    s1.setSales();
    s1.showSales();

    system("pause");
    return 0;
}

編程練習5

//stack.h
#ifndef STACK_H_
#define STACK_H_

struct customer {
    char fullname[35];
    double payment;
};
typedef customer Item;

class Stack
{
private:
    enum {MAX = 10};
    Item items[MAX];
    int top;
    double totalpay;
public:
    Stack();
    ~Stack();
    bool isempty() const;
    bool isfull() const;
    bool push(const Item & item);
    bool pop(Item & item);
};
#endif

//stack.cpp
#include "Stack.h"
#include <iostream>
using namespace std;

Stack::Stack()
{
    top = 0;
    totalpay = 0;
}


Stack::~Stack()
{
}

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];
        totalpay += item.payment;
        cout << "now the payment is " << totalpay << endl;
        return true;
    }
    else
        return false;
}

//main.cpp
#include <iostream>
#include <cctype>
#include "Stack.h"

int main()
{
    using namespace std;
    Stack st;
    char ch;
    customer c;
    cout << "Please enter A to add a customer, " << endl;
    cout << "P to process a custmer, or Q to quite" << endl;
    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 the customer's name: ";
            cin.get(c.fullname, 35);
            cout << "Enter the customer's payment: ";
            cin >> c.payment;
            //cin.get();
            if (st.isfull())
                cout << "stack already full" << endl;
            else
                st.push(c);
            break;
        case 'p':
        case 'P':
            if (st.isempty())
                cout << " Stack already empty" << endl;
            else
            {
                st.pop(c);  
                cout << " pause" << endl;
            }
            break;

        }
        cout << "Please enter A to add a customer, " << endl;
        cout << "P to process a custmer, or Q to quite" << endl;

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

編程練習6

//move.h
#ifndef MOVE_H_
#define MOVE_H_
class Move
{
private:
    double x;
    double y;
public:
    Move(double a = 0, double b = 0);
    ~Move(void);
    void showmove() const;
    Move add(const Move & m) const;
    void reset(double a = 0, double b = 0);
};
#endif

//move.cpp
#include "Move.h"
#include <iostream>
using namespace std;

Move::Move(double a, double b)
{
    x = a;
    y = b;
}


Move::~Move(void)
{
}

void Move::showmove() const
{
    cout << "Current x is " << x << ", and current y is " << y << endl;
}

Move Move::add(const Move & m) const
{
    Move newmove(m.x+x, m.y+y);
    return newmove;
}

void Move::reset(double a, double b)
{
    x = a;
    y = b;
}

//main.cpp
#include "Move.h"
#include <iostream>

int main()
{
    Move move1;
    move1.showmove();

    Move move2(3,5);
    Move move3(1,2);
    move2.showmove();
    move3.showmove();

    Move move4 = move3.add(move2);
    move4.showmove();

    move4.reset();
    move4.showmove();

    system("pause");
    return 0;
}

編程練習7

//plorg.h
#ifndef PLORG_H_
#define PLORG_H_

class Plorg
{
private:
    char name[20];
    int CI;
public:
    Plorg(char *n  = "Plorga");
    ~Plorg();
    void showplorg() const;
    void newCI(int ci);
};

#endif

//plorg.cpp
#include "Plorg.h"
#include <cstring>
#include <iostream>
using namespace std;

Plorg::Plorg(char *n)
{
    CI = 50;
    strcpy(name,n);
}


Plorg::~Plorg()
{
}

void Plorg::showplorg() const
{
    cout << name << " 's CI is " << CI << endl;
}

void Plorg::newCI(int ci) 
{
    CI = ci;
}

//main.cpp
#include "Plorg.h"
#include <iostream>

int main()
{
    Plorg p1;
    p1.showplorg();

    Plorg p2("PPPP");
    p2.showplorg();

    p2.newCI(90);
    p2.showplorg();
    system("pause");
    return 0;
}

練習8涉及到模板函數，函數指針等知識，這裏先偷個懶，之後補上