[C++知识库]C++实验：类与对象

1、实验内容

6) 定义一个类Stock，记录一支股票交易的基本信息，信息包括交易日序号（表示本月的第几个交易日，用整数表示）、当日最高价、当日最低价、当日开盘价和当日收盘价。尽量发挥想象力，为该类设计成员函数。

??? 7) 在主函数中建立两个股票对象，分别存储该股票昨天和今天两天的信息，以当日收盘价计算该股票今天的涨幅。

??? 8) 使用股票类Stock定义一个对象数组存放连续5个交易日的股票信息。编写一个主函数，计算两个Stock对象（前后两日）的当日收盘价，计算当日涨幅。用指针引用对象数组中的两个对象。在主函数中调用该函数计算从第2个交易日开始每天的当日涨幅。

??? 9) 在Stock类中定义一个静态数据成员，记录当前Stock对象的数量。

??? 10) 设计一个成员函数Assign_stock为对象赋值，其中的形式参数是对另一个Stock对象的引用，使用this指针避免对自己的赋值，在主函数中显示用Assign_stock赋值的对象。

11) 定义一个友元函数计算Stock对象的当日开盘价是否高于当日收盘价。若是，返回真；否则，返回假。

2、代码

6) 定义一个类Stock，记录一支股票交易的基本信息，信息包括交易日序号（表示本月的第几个交易日，用整数表示）、当日最高价、当日最低价、当日开盘价和当日收盘价。尽量发挥想象力，为该类设计成员函数。

#pragma once

#include<iostream>

using namespace std;

class Stock

{

private:

?????? int Number;

?????? double Max;

?????? double Min;

?????? double Begin;

?????? double End;

public:

?????? Stock();

?????? Stock(int n, double ma, double mi, double b, double e);

?????? double Get_End();

?????? void Show_Stock();

};

#include "Stock.h"

Stock::Stock()

{

???????? Number = 0;

???????? Max = 0;

???????? Min = 0;

???????? Begin = 0;

???????? End = 0;

}

double Stock::Get_End()

{

???????? return End;

}

Stock::Stock(int n, double ma, double mi, double b, double e)

{

???????? Number = n;

???????? Max = ma;

???????? Min = mi;

???????? Begin = b;

???????? End = e;

}

void Stock::Show_Stock()

{

???????? cout << Number << endl;

???????? cout << Max << endl;

???????? cout << Min << endl;

???????? cout << Begin << endl;

???????? cout << End << endl;

}

7) 在主函数中建立两个股票对象，分别存储该股票昨天和今天两天的信息，以当日收盘价计算该股票今天的涨幅。

#pragma once

#include<iostream>

using namespace std;

class Stock

{

private:

?????? int Number;

?????? double Max;

?????? double Min;

?????? double Begin;

?????? double End;

public:

?????? Stock();

?????? Stock(int n, double ma, double mi, double b, double e);

?????? double Get_End();

?????? void Show_Stock();

};

#include "Stock.h"

Stock::Stock()

{

???????? Number = 0;

???????? Max = 0;

???????? Min = 0;

???????? Begin = 0;

???????? End = 0;

}

double Stock::Get_End()

{

???????? return End;

}

Stock::Stock(int n, double ma, double mi, double b, double e)

{

???????? Number = n;

???????? Max = ma;

???????? Min = mi;

???????? Begin = b;

???????? End = e;

}

void Stock::Show_Stock()

{

???????? cout << Number << endl;

???????? cout << Max << endl;

???????? cout << Min << endl;

???????? cout << Begin << endl;

???????? cout << End << endl;

}

#include <iostream>

#include "Stock.h"

using namespace std;

int main()

{

?????? double rate;

?????? Stock s1(1, 3.2, 2.3, 2.5, 3.1);

?????? Stock s2(2, 4.2, 3.6, 3.9, 3.8);

?????? rate = (s2.Get_End() - s1.Get_End()) / s1.Get_End() * 100;

?????? cout << "以当日收盘价计算该股票今天的涨幅为：" << rate << "%" << endl;

}

8) 使用股票类Stock定义一个对象数组存放连续5个交易日的股票信息。编写一个主函数，计算两个Stock对象（前后两日）的当日收盘价，计算当日涨幅。用指针引用对象数组中的两个对象。在主函数中调用该函数计算从第2个交易日开始每天的当日涨幅。

#pragma once

#include<iostream>

using namespace std;

class Stock

{

private:

?????? int Number;

?????? double Max;

?????? double Min;

?????? double Begin;

?????? double End;

public:

?????? Stock();

?????? Stock(int n, double ma, double mi, double b, double e);

?????? double Get_End();

?????? void Show_Stock();

?????? void Set_Stock();

};

#include "Stock.h"

Stock::Stock()

{

?????? Number = 0;

?????? Max = 0;

?????? Min = 0;

?????? Begin = 0;

?????? End = 0;

}

double Stock::Get_End()

{

?????? return End;

}

Stock::Stock(int n, double ma, double mi, double b, double e)

{

?????? Number = n;

?????? Max = ma;

?????? Min = mi;

?????? Begin = b;

?????? End = e;

}

void Stock::Show_Stock()

{

?????? cout << Number << endl;

?????? cout << Max << endl;

?????? cout << Min << endl;

?????? cout << Begin << endl;

?????? cout << End << endl;

}

void Stock::Set_Stock()

{

?????? cout << "Number:";

?????? cin >> Number;

?????? cout << "Max:";

?????? cin >> Max;

?????? cout << "Min:";

?????? cin >> Min;

?????? cout << "Begin:";

?????? cin >> Begin;

?????? cout << "End:";

?????? cin >> End;

}

#include <iostream>

#include "Stock.h"

using namespace std;

int main()

{

?????? int i;

?????? Stock s[5],*p;

?????? for (i = 0,p=s; i < 5; i++,p++)

?????? {

????????????? p->? Set_Stock();

?????? }

?????? for (i = 0,p = s; i < 5; i++)

?????? {

????????????? s->Show_Stock();

?????? }

?????? for (i = 1,p=s+1; i < 5; i++,p++)

?????? {

?????????????

????????????? cout << "涨幅为：" << ((p->Get_End() - (p-1)->Get_End()) / (p-1)->Get_End() * 100) << "%"<<endl;

?????? }

}

9) 在Stock类中定义一个静态数据成员，记录当前Stock对象的数量。

#pragma once

#include<iostream>

using namespace std;

class Stock

{

private:

?????? static int count;

?????? int Number;

?????? double Max;

?????? double Min;

?????? double Begin;

?????? double End;

public:

?????? Stock();

?????? Stock(int n, double ma, double mi, double b, double e);

?????? double Get_End();

?????? void Show_Stock();

?????? void Set_Stock();

?????? int Count();

};

#include "Stock.h"

int Stock::count = 0;

Stock::Stock()

{

?????? count++;

?????? Number = 0;

?????? Max = 0;

?????? Min = 0;

?????? Begin = 0;

?????? End = 0;

}

double Stock::Get_End()

{

?????? count++;

?????? return End;

}

Stock::Stock(int n, double ma, double mi, double b, double e)

{

?????? count++;

?????? Number = n;

?????? Max = ma;

?????? Min = mi;

?????? Begin = b;

?????? End = e;

}

void Stock::Show_Stock()

{

?????? count++;

?????? cout << Number << endl;

?????? cout << Max << endl;

?????? cout << Min << endl;

?????? cout << Begin << endl;

?????? cout << End << endl;

}

void Stock::Set_Stock()

{

?????? count++;

?????? cout << "Number:";

?????? cin >> Number;

?????? cout << "Max:";

?????? cin >> Max;

?????? cout << "Min:";

?????? cin >> Min;

?????? cout << "Begin:";

?????? cin >> Begin;

?????? cout << "End:";

?????? cin >> End;

}

int Stock::Count()

{

?????? count++;

?????? return count;

}

#include <iostream>

#include "Stock.h"

using namespace std;

int main()

{

?????? int i;

?????? Stock s[5],*p;

?????? for (i = 0,p=s; i < 5; i++,p++)

?????? {

????????????? p->? Set_Stock();

?????? }

?????? for (i = 0,p = s; i < 5; i++)

?????? {

????????????? s->Show_Stock();

?????? }

?????? for (i = 1,p=s+1; i < 5; i++,p++)

?????? {

????????????? cout << "涨幅为：" << ((p->Get_End() - (p-1)->Get_End()) / (p-1)->Get_End() * 100) << "%"<<endl;

????????????? cout << "当前Stock的对象的个数为：" << p->Count() << endl;

?????? }

}

10) 设计一个成员函数Assign_stock为对象赋值，其中的形式参数是对另一个Stock对象的引用，使用this指针避免对自己的赋值，在主函数中显示用Assign_stock赋值的对象。

#pragma once

#include<iostream>

using namespace std;

class Stock

{

private:

?????? static int count;

?????? int Number;

?????? double Max;

?????? double Min;

?????? double Begin;

?????? double End;

public:

?????? Stock();

?????? Stock(int n, double ma, double mi, double b, double e);

?????? double Get_End();

?????? void Show_Stock();

?????? void Set_Stock();

?????? int Count();

?????? void Assign_stock(Stock& p);

};

#include "Stock.h"

int Stock::count = 0;

Stock::Stock()

{

?????? count++;

?????? Number = 0;

?????? Max = 0;

?????? Min = 0;

?????? Begin = 0;

?????? End = 0;

}

double Stock::Get_End()

{

?????? count++;

?????? return End;

}

Stock::Stock(int n, double ma, double mi, double b, double e)

{

?????? count++;

?????? Number = n;

?????? Max = ma;

?????? Min = mi;

?????? Begin = b;

?????? End = e;

}

void Stock::Show_Stock()

{

?????? count++;

?????? cout << Number << endl;

?????? cout << Max << endl;

?????? cout << Min << endl;

?????? cout << Begin << endl;

?????? cout << End << endl;

}

void Stock::Set_Stock()

{

?????? count++;

?????? cout << "Number:";

?????? cin >> Number;

?????? cout << "Max:";

?????? cin >> Max;

?????? cout << "Min:";

?????? cin >> Min;

?????? cout << "Begin:";

?????? cin >> Begin;

?????? cout << "End:";

?????? cin >> End;

}

int Stock::Count()

{

?????? count++;

?????? return count;

}

void Stock::Assign_stock(Stock& p)

{

?????? if (this != &p)

?????? {

????????????? Number = p.Number;

????????????? Max = p.Max;

????????????? Min = p.Min;

????????????? Begin = p.Begin;

????????????? End = p.End;

?????? }

}

#include <iostream>

#include "Stock.h"

using namespace std;

int main()

{

?????? Stock s1(3, 7.4, 6.5, 6.65, 7.23);

?????? Stock s2;

?????? s2.Assign_stock(s1);

?????? s2.Show_Stock();

}

11) 定义一个友元函数计算Stock对象的当日开盘价是否高于当日收盘价。若是，返回真；否则，返回假。

#pragma once

#include<iostream>

using namespace std;

class Stock

{

private:

?????? static int count;

?????? int Number;

?????? double Max;

?????? double Min;

?????? double Begin;

?????? double End;

public:

?????? Stock();

?????? Stock(int n, double ma, double mi, double b, double e);

?????? double Get_End();

?????? void Show_Stock();

?????? void Set_Stock();

?????? int Count();

?????? void Assign_stock(Stock& p);

?????? friend int GetStock(Stock& s1);

};

#include "Stock.h"

int Stock::count = 0;

Stock::Stock()

{

?????? count++;

?????? Number = 0;

?????? Max = 0;

?????? Min = 0;

?????? Begin = 0;

?????? End = 0;

}

double Stock::Get_End()

{

?????? count++;

?????? return End;

}

Stock::Stock(int n, double ma, double mi, double b, double e)

{

?????? count++;

?????? Number = n;

?????? Max = ma;

?????? Min = mi;

?????? Begin = b;

?????? End = e;

}

void Stock::Show_Stock()

{

?????? count++;

?????? cout << Number << endl;

?????? cout << Max << endl;

?????? cout << Min << endl;

?????? cout << Begin << endl;

?????? cout << End << endl;

}

void Stock::Set_Stock()

{

?????? count++;

?????? cout << "Number:";

?????? cin >> Number;

?????? cout << "Max:";

?????? cin >> Max;

?????? cout << "Min:";

?????? cin >> Min;

?????? cout << "Begin:";

?????? cin >> Begin;

?????? cout << "End:";

?????? cin >> End;

}

int Stock::Count()

{

?????? count++;

?????? return count;

}

void Stock::Assign_stock(Stock& p)

{

?????? if (this != &p)

?????? {

????????????? Number = p.Number;

????????????? Max = p.Max;

????????????? Min = p.Min;

????????????? Begin = p.Begin;

????????????? End = p.End;

?????? }

}

int GetStock(Stock&s1)

{

?????? cout << s1.Begin << "\t" << s1.End;

?????? if ((s1.Begin) > (s1.End))

????????????? return 1;

?????? else return 0;

}

#include <iostream>

#include "Stock.h"

using namespace std;

int main()

{

?????? int i;

?????? Stock s[5], * p;

?????? for (i = 0, p = s; i < 5; i++, p++)

?????? {

????????????? p->Set_Stock();

?????? }

?????? for (i = 0, p = s; i < 5; i++)

?????? {

????????????? s->Show_Stock();

?????? }

?????? for (i = 1, p = s + 1; i < 5; i++, p++)

?????? {

????????????? cout << "涨幅为：" << ((p->Get_End() - (p - 1)->Get_End()) / (p - 1)->Get_End() * 100) << "%" << endl;

????????????? cout << "当前Stock的对象的个数为：" << p->Count() << endl;

?????? }

?????? for (i = 0, p = s; i < 5; i++, p++)

?????? {

????????????? cout << GetStock(*p) << endl;

?????? }

}