【C++学习】习题记录 第十章 对象和类

已于 2024-02-19 09:10:21 修改
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分类专栏： C++学习 文章标签： c++
于 2017-04-06 23:54:11 首次发布
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第十章 对象和类

第一题：定义一个银行账户类，包括姓名，账号，存款及对应成员函数。

//file1   one.cpp
#include<iostream>
#include<string>
class Bank
{
private:
	std::string name;
	std::string acount;
	double money;
public:
	void setBank(Bank &b);
	void showBank(Bank &b);
	void saveBank(Bank &b);
	void drawBank(Bank &b);
};

void Bank::setBank(Bank &b)
{
	using std::cout;
	using std::cin;
	using std::endl;
	cout << "Please enter the user's name: ";
	getline(cin, b.name);
	cout << "Please enter the user's acount: ";
	cin >> b.acount;
	cout << "Please enter the user's money: ";
	cin >> b.money;
}

void Bank::showBank(Bank &b)
{
	std::cout << "Name :" << b.name << std::endl;
	std::cout << "Acount :" << b.acount << std::endl;
	std::cout << "Money :" << b.money<< std::endl;
}
void Bank::saveBank(Bank &b)
{
	std::cout << "How much do you want to save ?  ";
	double mo;
	std::cin >> mo;
	b.money = b.money + mo;
	std::cout << "Now the balanec:" <<b.money<< std::endl;
}
void Bank::drawBank(Bank &b)
{
	std::cout << "How much do you want to draw ?  ";
	double mo;
	std::cin >> mo;
	while (mo > b.money)
	{
		std::cout << "You draw too much!\n";
		std::cout << "So,how much do you really want to draw ?  ";
		std::cin >> mo;
	}
	b.money = b.money - mo;
	std::cout << "Now the balanec:" << b.money<< std::endl;
}

int main()
{
	Bank usea;
	usea.setBank(usea);
	usea.saveBank(usea);
	usea.drawBank(usea);
	usea.showBank(usea);

	system("pause");
	return 0;
}

结果显示10.1

第二题：补全所给程序，并测试。

//file1  twohead.h
#include<iostream>
#include<string>

class Person{
private :
	static const int LIMIT = 25;
	std::string lname;
	char fname[LIMIT];
public:
	Person()
	{
		lname = " "; 
		fname[0] = '\0'; 
	};
	Person(const std::string &ln, const char *fn = "Heyyou");
	void Show() const;
	void FormalShow() const;
};

//file2 twohead.cpp
#include"twohead.h"
using namespace std;
Person::Person(const string &ln, const char *fn )
{
	lname = ln;
	int i = 0;
		for (; i < LIMIT; i++)
		{
			if(!fn)
			{
				break;
			}
			fname[i] = *fn;
			fn++;
		}
}

 void Person::Show() const
 {
	 std::cout << fname << " " << lname;
 }
 void Person::FormalShow() const
 {
	 std::cout << lname << " " << fname;
 }


//file3 two.cpp
#include<iostream>
#include"twohead.h"
int main()
{
	Person one;
	Person two("GOODBOY");
	Person three("DIMWIDDY", "Sam");
	one.Show();
	one.FormalShow();
	std::cout << std::endl;
	two.Show();
	std::cout << std::endl;
	two.FormalShow();
	std::cout << std::endl;
	three.Show();
	std::cout << std::endl;
	three.FormalShow();
	std::cout << std::endl;
	system("pause");
	return 0;
}

结果显示10.2

第三题：完成上一章的编程练习1，使用golf类声明，并使用构造函数来提供初始值，使用this指针。

//file1 threehead.h
#ifndef THREEHEAD_H_
#define THREEHEAD_H_
class golf
{
	private:
		char fullname[40];
		int handicap;
	public:
		golf();
		golf(const char *name, int hc=0);
		~golf();
		golf & setgolf();
		void showgolf();
};
#endif 

//file2 threehead.cpp
#include<iostream>
#include<cstring>
#include"threehead.h"
golf::golf()
{
	std::cout << "Default constructor" << std::endl;
	fullname[40] = '\0';
	handicap = 0;
	
}
golf::golf(const char *name, int hc)
{
	strncpy_s(fullname, name, 40);
	fullname[40] = '\0';
	handicap = hc;

}
golf::~golf()
{
	std::cout << "Destructor\n";
}
golf & golf::setgolf()
{
	char funa[40];
	int  hacp;

	std::cout << "Enter name: " ;
	std::cin.getline(funa, 40);

	std::cout << "Enter handicap: ";
	std::cin >> hacp;

	golf temp(funa,hacp);
	strcpy_s(fullname, temp.fullname);
	handicap = temp.handicap;
	return *this;
}
void golf::showgolf()
{
	std::cout << "Name is: " <<fullname<<"\n";
	std::cout << "Handicap is:  " <<handicap<<"\n";
}

//file3 three.cpp
#include<iostream>
#include"threehead.h"

int main()
{

	golf play1("goodman");
	play1.showgolf();
	golf play2("badman",44);
	play2.showgolf();
	golf play3;
	play3.setgolf();
	play3.showgolf();

	return 0;
}

结果显示10.3

第四题：完成上一章的编程练习4，将Sales结构及相关函数转换为一个类及方法，使用构造函数是实现原来的交互实现。

//file1 fourhead.h
#ifndef FOURHEAD_H_
#define FOURHEAD_H_
namespace SALES
{
	const int QUARTERS = 4;
	struct Sales
		{
			double sales[QUARTERS];
			double average;
			double max;
			double min;
		};
	class sl
	{
		private: 
			Sales temp;
		public:
			sl();
			sl(sl &s);
			void showSales();
	};
}
#endif

//file2 fourhead.cpp
#include<iostream>
#include"fourhead.h"
namespace SALES{

	using namespace std;
	sl::sl()
	{
		double sum=0;
		for (int i = 0; i < QUARTERS; i++)
		{
			cout << "Please enter a number: ";
			cin >> temp.sales[i];
			temp.max = temp.min = temp.sales[0];
			if (temp.max <= temp.sales[i])
				temp.max = temp.sales[i];
			if (temp.min >= temp.sales[i])
				temp.min = temp.sales[i];
			sum += temp.sales[i];
		}
		temp.average = sum / QUARTERS;
	}
	sl::sl(sl &s)
	{
		double sum=0;
		for (int i = 0; i < QUARTERS; i++)
		{
			s.temp.max = s.temp.min = s.temp.sales[0];
			if (s.temp.max <= s.temp.sales[i])
				s.temp.max = s.temp.sales[i];
			if (s.temp.min >= s.temp.sales[i])
				s.temp.min = s.temp.sales[i];
			sum += s.temp.sales[i];
		}
		s.temp.average = sum / QUARTERS;
	}

	void sl::showSales()
	{
		cout << "THE average is: " << temp.average << endl;
		cout << "THE max is: " << temp.max << endl;
		cout << "THE min is: " << temp.min << endl;
	}

}

//file3 four.cpp
#include<iostream>
#include"fourhead.h"
using namespace	SALES;
int main()
{
	sl ca1;
	ca1.showSales();
	sl(ca2);
	ca2.showSales();
	system("pause");
	return 0;
}

结果显示10.4

第五题：完成指定结构声明，使用堆栈来删除和添加该结构。

// file  five.cpp
#include<iostream>
struct customer
{
	char fullname[35];
	double payment;
};
typedef customer* Item;
using namespace std;
int main()
{
	
	Item ps = new customer;
	cout << "Please enter infomation(enter q quit)\n";
	cout << "The name: ";
	cin >> ps->fullname;
	int count = 0;
	while (strcmp(ps->fullname, "q"))
	{
		cin.get();
		cout << "The pay ment: ";
		cin >> ps->payment;
		count++;
		cin.get();
		ps++; 
		cout << "The name: ";
		cin >> ps->fullname;
	}
	ps--;
	cout << "Do you wann delete " << ps->fullname;
	cout << " ? y/n ";
	char choose;
	double amount=0;
	cin >> choose;
	while (count)
	{

		if (choose == 'y')
		{
			amount = amount += ps->payment;
		}
		cout << "Now the money is " << amount << endl;
		ps--;
		if (--count)
		{
			cout << "Do you wann delete " << ps->fullname;
			cout << " ? y/n ";
		}
		else
		{
			cout << "No users now ";
			break;
		}
		cin >> choose;
	}
	ps++;
	delete ps;

	system("pause");
}

结果显示10.5

ps:程序再结束时可能因为指针的原因出现异常，待以后再解决。

第六题：完成指定类声明，并提供对应函数定义，最后进行测试。

// file  six
#include<iostream>
using namespace std;
class Move
{
public:
	Move(double a = 0, double b = 0);
	void Moveadd(const Move &m) ;
	void showmove()const;
	void reset(double a = 0, double b = 0);
private:
	double x;
	double y;
};

Move::Move(double a , double b )
{
	x = a;
	y = b;
}
void Move::showmove()const
{
	cout << "x is " << x << " , y is " << y << " .\n";
}
void Move::reset(double a, double b)
{
	x = a;
	y = b;
}
void Move::Moveadd(const Move &m) 
{
	x = x + m.x;
	y = y + m.y;
}
int main()
{
	Move a;
	cout << "a inclued: ";
	a.showmove();
	Move b(3, 5);
	cout << "b inclued: ";
	b.showmove();
	Move c(7, 5);
	cout << "c inclued: ";
	c.showmove();
	b.Moveadd(c);
	cout << "b+c is: ";
	b.showmove();
	b.reset();
	cout << "b after reset: ";
	b.showmove();
	system("pause");
}

结果显示10.6

第七题：完成要求类声明，并提供对应函数定义，最后进行测试。

//file1 sevenhead.h
#ifndef SEVENHEAD_H_
#define SEVENHEAD_H_

class plorg
{
	
private:
	char name[19];
	int CI;
public:
	plorg(char n[]="Plorga",int c=50);
	void showplorg()const;
	void setci(int a);
};
#endif // !SEVENHEAD_H_

//file2 sevenhead.cpp
#include"sevenhead.h"
#include<iostream>
#include<string>
plorg::plorg(char n[], int c )
{
	//for(int i=0;i<19;i++)
	//name[i]= n[i];
	
	strncpy_s(name, n,18);
	name[19] = '\0';
	CI = c;
}
void plorg::showplorg()const
{
	std::cout << "name: "<<name;
	std::cout << ". CI: " << CI << std::endl;
}
void  plorg::setci(int a)
{
	CI = a;
}

//file3 seven.cpp
#include<iostream>
#include"sevenhead.h"
int main()
{
	plorg a;
	a.showplorg();
	plorg b("good boy BOYBOYBOYBOYBOYBOYBOYBOY", 66);
	b.showplorg();
	b.setci(72);
	b.showplorg();
	
	system("pause");
	return 0;
}

结果显示10.7

第八题：完成要求列表定义，使用类方法实现部分功能，并使用函数应用对其进行操作。

//file1 eighthead.h
#ifndef _EIGHTHEAD_
#define _EIGHTHEAD_
typedef unsigned long Item;
class List
{
private:
	enum {MAX=10};
	Item list[MAX];
	int top;
public:
	List();
	bool isempty()const;
	bool isfull()const;
	bool push(const Item & item);
	bool pop(Item & item);
	void visit(void (*pf)(Item &));
};
#endif

//file2  eighthead.cpp
#include"eighthead.h"
#include<iostream>
List::List()
{
	top = 0;
}
bool List::isempty()const
{
	if (top == 0)
		return true;
	else
		return false;
}
bool List::isfull()const
{

	if (top == MAX)
		return true;
	else
		return false;
}

bool List::push(const Item & item)
{
	if (top < MAX)
	{
		list[top++] = item;
		return true;
	}
	else
	{
		return false;
	}
}
bool List::pop( Item & item)
{
	if (top > 0)
	{
		item=list[--top];
		return true;
	}
	else
	{
		return false;
	}
}
void  List::visit(void (*pf)(Item & ))
{
	for (int i = 0; i < top; i++)
	(*pf)(list[i]);
}


//file3 eight.cpp
#include<iostream>
#include"eighthead.h"
using namespace std;
void showlist(Item & item);
int main()
{

	List IT;
	Item c,b;
	c = 64;
	for (int i = 0; i < 10; i++)
	{
		IT.push(c);
	}
	IT.visit(showlist);
	cout << IT.isempty() << endl;
	cout << IT.isfull() << endl;
	for (int i = 0; i < 10; i++)
	{
		IT.pop(b);
	}
	cout << IT.isempty() << endl;
	cout << IT.isfull() << endl;
	system("pause");
	return 0;
}
void showlist(Item & item)
{
	cout << item << endl;
}

结果显示10.8

ps：第十章完成了，感觉最后学习继承，友元等几个概念后可以开始实战了。虽然很多外界压力，挺住，加油！

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