C++实验：类与对象

2021-09-04 23:51:59

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

#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;

}

#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;

}

#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;

}

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1、实验内容

2、代码

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