C++ Primer 15 프로그래밍 연습

01

// tv.h

#ifndef TV_H_
#define TV_H_

class Remote;

class Tv
{
	public:
		friend class Remote;
		enum {Off, On};
		enum {MinVal, MaxVal = 20};
		enum {Antenna, Cable};
		enum {TV, DVD};
		enum {NORMAL, CONVERSATION};

		Tv(int s = Off, int mc = 125) : state(s), volume(5),
			maxchannel(mc), channel(2), mode(Cable), input(TV) {}
		void onoff() { state = (state == On) ? Off : On; }
		bool ison() const { return state == On; }
		bool volup();
		bool voldown();
		void chanup();
		void chandown();
		void set_mode() { mode = (mode == Antenna) ? Cable : Antenna; }
		void set_input() { input = (input == TV ) ? DVD : TV; }
		void settings() const;
		void set_mode2(Remote & r);

	private:
		int state;
		int volume;
		int maxchannel;
		int channel;
		int mode;
		int input;
};

class Remote
{
	private:
		friend class Tv;
		int mode;
		int mode2;
	public:
		Remote(int m = Tv::TV, int m2 = Tv::NORMAL) : mode(m), mode2(m2) {}
		bool volup(Tv & t) { return t.volup(); }
		bool voldown(Tv & t) { return t.voldown(); }
		void onfoff(Tv & t) { t.onoff(); }
		void chanup(Tv & t) { t.chanup(); }
		void chandown(Tv & t) { t.chandown(); }
		void set_chan(Tv & t, int c) { t.channel = c; }
		void set_mode(Tv & t) { t.set_mode(); }
		void set_input(Tv & t) { t.set_input(); }
		void show_mode2(Tv & t);
};

#endif

// tv.cpp

#include "tv.h"
#include <iostream>

bool Tv::volup()
{
	if (volume < MaxVal)
	{
		volume++;
		return true;
	}
	else
		return false;
}

bool Tv::voldown()
{
	if (volume > MinVal)
	{
		volume--;
		return true;
	}
	else
		return false;
}

void Tv::chanup()
{
	if (channel < maxchannel)
		channel++;
	else
		channel = 1;
}

void Tv::chandown()
{
	if (channel > 1)
		channel--;
	else
		channel = maxchannel;
}

void Tv::settings() const
{
	using std::cout;
	using std::endl;
	cout << "TV = " << (state == Off ? "OFF" : "ON") << endl;
	if (state == On)
	{
		cout << "볼륨 = " << volume << endl;
		cout << "채널 = " << channel << endl;
		cout << "모드 = " << (mode == Antenna ? "지상파 방송" : "케이블 방송") << endl;
		cout << "입력 = " << (input == TV ? "TV" : "DVD") << endl;
	}
}

void Tv::set_mode2(Remote & r)
{
	if (state == On)
	{
		std::cout << "리모컨 모드 변경\n";
		r.mode2 = (r.mode2 == NORMAL) ? CONVERSATION : NORMAL;
	}
}

void Remote::show_mode2(Tv & t)
{
	std::cout << "리모컨 모드 = " << (mode2 == t.NORMAL ? "일반" : "대화") << std::endl;
}

// use_tv.cpp

#include "tv.h"
#include <iostream>

int main()
{
	using std::cout;
	Tv tv;
	Remote remote;

	tv.onoff();
	tv.settings();
	remote.show_mode2(tv);
	tv.set_mode2(remote);
	remote.show_mode2(tv);

	return 0;
}

---

02

// exc_mean2.h

#ifndef EXC_MEAN2_H_
#define EXC_MEAN2_H_
#include <iostream>

class bad_hmean : public std::logic_error
{
	private:
		double v1;
		double v2;
	public:
		bad_hmean(const char * c, double a = 0, double b = 0) : logic_error(c), v1(a), v2(b) {}
		void mesg();
};

inline void bad_hmean::mesg()
{
	std::cout << "hmean(" << v1 << ", " << v2 << ") : "
			  << "잘못된 매개변수 : a = -b\n";
}

class bad_gmean : public std::logic_error
{
	public:
		double v1;
		double v2;
		bad_gmean(const char * c, double a = 0, double b = 0) : logic_error(c), v1(a), v2(b) {}
		const char * mesg();
};

inline const char * bad_gmean::mesg()
{
	return "gmean() 매개변수들은 >= 0 이어야 합니다.\n";
}

#endif

// error5.cpp

#include "exc_mean.h"
#include <iostream>
#include <cmath>
#include <stdexcept>

double hmean(double a, double b);
double gmean(double a, double b);

int main()
{
	using std::cout;
	using std::cin;
	using std::endl;

	double x, y, z;

	cout << "두 수를 입력하십시오 : ";
	while (std::cin >> x >> y)
	{
		try {
				z = hmean(x, y);
				cout << x << ", " << y << "의 조화평균은 "
					 << z << "입니다.\n";
				cout << x << ", " << y << "의 기하평균은 "
					 << gmean(x,y) << "입니다.\n";
				cout << "다른 두 수를 입력하십시오 (끝내려면 q) : ";
		}
		catch (bad_hmean & bg)
		{
			cout << bg.what() << endl;
			bg.mesg();
			cout << "다시 하십시오.\n";
			continue;
		}
		catch (bad_gmean & hg)
		{
			cout << hg.what() << endl;	
			cout << hg.mesg();
			cout << "사용된 값 : " << hg.v1 << ", "
				 << hg.v2 << endl;
			cout << "죄송합니다. 더 이상 진행할 수 없습니다.\n";
			break;
		}
	}
	cout << "프로그램을 종료합니다.\n";
	return 0;
}

double hmean(double a, double b)
{
	if (a == -b)
		throw bad_hmean("hmean 에러!!!!!", a, b);
	return 2.0 * a * b / (a + b);
}

double gmean(double a, double b)
{
	if (a < 0 || b < 0)
		throw bad_gmean("gmean 에러!!!!!", a, b);
	return std::sqrt(a * b);
}

---

03

// exc_mean3.h

#ifndef EXC_MEAN2_H_
#define EXC_MEAN2_H_
#include <iostream>

class bad_: public std::logic_error
{
	private:
		double v1;
		double v2;
	public:
		bad_(const char * c, double a, double b) : logic_error(c), v1(a), v2(b) {}
		void show_what() { std::cout << what() << std::endl; }
		double one() { return v1; }
		double two() { return v2; }
		virtual void mesg() = 0;
};

class bad_hmean : public bad_
{
	public:
		bad_hmean(const char * c, double a, double b) : bad_(c, a, b) {}
		void mesg();
};

inline void bad_hmean::mesg()
{
	bad_::show_what();
	std::cout << "hmean(" << bad_::one() << ", " << bad_::two() << ") : "
			  << "잘못된 매개변수 : a = -b\n";
}

class bad_gmean : public bad_
{
	public:
		bad_gmean(const char * c, double a, double b) : bad_(c, a, b) {}
		void mesg();
};

inline void bad_gmean::mesg()
{
	bad_::show_what();
	std::cout << "gmean(" << bad_::one() << ", " << bad_::two() << ") : "
			  << "잘못된 매개변수 : 매개변수들은 >= 0 이어야 합니다.\n";
}

#endif

// error6.cpp

#include "xxx.h"
#include <iostream>
#include <cmath>
#include <stdexcept>

double hmean(double a, double b);
double gmean(double a, double b);

int main()
{
	using std::cout;
	using std::cin;
	using std::endl;

	double x, y, z;

	cout << "두 수를 입력하십시오 : ";
	while (std::cin >> x >> y)
	{
		try {
				z = hmean(x, y);
				cout << x << ", " << y << "의 조화평균은 "
					 << z << "입니다.\n";
				z = gmean(x, y);
				cout << x << ", " << y << "의 기하평균은 "
					 << z << "입니다.\n";
				cout << "다른 두 수를 입력하십시오 (끝내려면 q) : ";
		}
		catch (bad_ & b)
		{
			b.mesg();
			cout << "다시 하십시오.\n";
			continue;
		}
	}
	cout << "프로그램을 종료합니다.\n";
	return 0;
}

double hmean(double a, double b)
{
	if (a == -b)
		throw bad_hmean("hmean 에러!!!!!", a, b);
	return 2.0 * a * b / (a + b);
}

double gmean(double a, double b)
{
	if (a < 0 || b < 0)
		throw bad_gmean("gmean 에러!!!!!", a, b);
	return std::sqrt(a * b);
}

---

04

// use_sales2.cpp

#include "sales.h"
#include <iostream>

int main()
{
	using std::cout;
	using std::cin;
	using std::endl;

	double vals1[12] =
	{
		1220, 1100, 1122, 2212, 1232, 2334,
		2884, 2393, 3302, 2922, 3002, 3544
	};

	double vals2[12] =
	{
		12, 11, 22, 21, 32, 34,
		28, 29, 33, 29, 32, 35
	};

	Sales sales1(2011, vals1, 12);
	LabeledSales sales2("Blogstar", 2012, vals2, 12);

	cout << "첫 번째 try 블록 : \n";
	try
	{
		int i;
		cout << "Year = " << sales1.Year() << endl;
		for (i = 0; i < 12; ++i)
		{
			cout << sales1[i] << ' ';
			if (i % 6 == 5)
				cout << endl;
		}
		cout << "Year = " << sales2.Year() << endl;
		cout << "Label = " << sales2.Label() << endl;
		for (i = 0; i <= 12; ++i)
		{
			cout << sales2[i] << ' ';
			if (i % 6 == 5)
				cout << endl;
		}
	}
	catch(Sales::bad_index & bad)
	{
		cout << bad.what();
		if (typeid(LabeledSales::nbad_index) == typeid(bad))
		{
			LabeledSales::nbad_index nbad = dynamic_cast<LabeledSales::nbad_index &>(bad);
			cout << "Company : " << nbad.label_val() << endl;
		}
		cout << "잘못된 인덱스 : " << bad.bi_val() << endl;
	}

	cout << "\n다음 try 블록 : \n";
	try
	{
		sales2[2] = 37.5;
		sales1[20] = 23345;
		cout << "try 블록 2의 끝\n";
	}
	catch(Sales::bad_index & bad)
	{
		cout << bad.what();
		if (typeid(LabeledSales::nbad_index) == typeid(bad))
		{
			LabeledSales::nbad_index nbad = dynamic_cast<LabeledSales::nbad_index &>(bad);
			cout << "Company : " << nbad.label_val() << endl;
		}
		cout << "잘못된 인덱스 : " << bad.bi_val() << endl;
	}
	cout << "프로그램을 종료합니다.\n";

	return 0;
}