명품 C++ 프로그래밍 7장 연습문제

Written by 박민영 on Mar 8th, 2022 ・ Views ・ Report Post

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7-1

(1)

#include <iostream>
#include <string>
using namespace std;

class Book {
	string title;
	int price, pages;
public:
	Book(string title = "", int price = 0, int pages = 0) {
		this->title = title; this->price = price; this->pages = pages;
	}
	void show() {
		cout << title << ' ' << price << "원 " << pages << " 페이지" << endl;
	}
	string getTitle() { return title; }
	Book& operator +=(int op2) {
		price += op2;
		return *this;
	}
	Book& operator -=(int op2) {
		price -= op2;
		return *this;
	}
};

int main() {
	Book a("청춘", 20000, 300), b("미래", 30000, 500);
	a += 500;
	b -=500;
	a.show();
	b.show();
}

(2)

#include <iostream>
#include <string>
using namespace std;

class Book {
	string title;
	int price, pages;
public:
	Book(string title = "", int price = 0, int pages = 0) {
		this->title = title; this->price = price; this->pages = pages;
	}
	void show() {
		cout << title << ' ' << price << "원 " << pages << " 페이지" << endl;
	}
	string getTitle() { return title; }
	friend Book& operator +=(Book& op1,int price); //참조를 리턴하지 않아도 결과는 같다.
	friend Book& operator -=(Book& op1,int price);
};

Book& operator +=(Book& op1,int price) {
	op1.price += price;
	return op1;
}
Book& operator -=(Book& op1,int price) {
	op1.price -= price;
	return op1;
}

int main() {
	Book a("청춘", 20000, 300), b("미래", 30000, 500);
	a += 500;
	b -= 500;
	a.show();
	b.show();
}

7-2

(1)

#include <iostream>
#include <string>
using namespace std;

class Book {
	string name;
	int price;
	int pages;
public:
	Book(string name, int price, int pages);
	bool operator ==(int price);
	bool operator ==(string name);
	bool operator ==(Book a);
};

Book::Book(string name, int price, int pages) {
	this->name = name;
	this->price = price;
	this->pages = pages;
}

bool Book::operator ==(int price) {
	if (this->price == price)
		return true;
	else return false;
}

bool Book::operator ==(string name) {
	if (this->name.compare(name) == 0)
		return true;
	else return false;
}

bool Book::operator ==(Book a) {
	if (this->name.compare(a.name) == 0 && this->price == a.price && this->pages == a.pages)
		return true;
	else return false;
}

int main() {
	Book a("명품 C++", 30000, 500), b("고품 C++", 30000, 500);
	if (a == 30000)cout << "정가 30000원" << endl;
	if (a == "명품 C++")cout << "명품 C++ 입니다." << endl;
	if (a == b)cout << "두 책이 같은 책입니다." << endl;
}

(2)

#include <iostream>
#include <string>
using namespace std;

class Book {
	string name;
	int price;
	int pages;
public:
	Book(string name, int price, int pages);
	friend bool operator ==(Book a,int price);
	friend bool operator ==(Book a,string name);
	friend bool operator ==(Book a,Book b);
};

Book::Book(string name, int price, int pages) {
	this->name = name;
	this->price = price;
	this->pages = pages;
}

bool operator ==(Book a,int price) {
	if (a.price == price)
		return true;
	else return false;
}

bool operator ==(Book a,string name) {
	if (a.name.compare(name) == 0)
		return true;
	else return false;
}

bool operator ==(Book a,Book b) {
	if (a.name.compare(b.name) == 0 && a.price == b.price && a.pages == b.pages)
		return true;
	else return false;
}

int main() {
	Book a("명품 C++", 30000, 500), b("고품 C++", 30000, 500);
	if (a == 30000)cout << "정가 30000원" << endl;
	if (a == "명품 C++")cout << "명품 C++ 입니다." << endl;
	if (a == b)cout << "두 책이 같은 책입니다." << endl;
}

7-3

#include <iostream>
#include <string>
using namespace std;

class Book {
	string title;
	int price;
int pages;
public:
	Book(string title, int price, int pages);
	bool operator !();
};

Book::Book(string title, int price, int pages) {
	this->title = title;
	this->price = price;
	this->pages = pages;
}

bool Book::operator !() {
	if (this->price == 0)
		return true;
}

int main() {
	Book book("벼룩시장",0,50);
	if (!book)cout << "공짜다" << endl;
}

7-4

#include <iostream>
#include <string>
using namespace std;

class Book {
	string title;
	int price;
	int pages;
public:
	Book(string title, int price, int pages);
	friend bool operator <(string str, Book a);
	string getTitle();
};

Book::Book(string title, int price, int pages) {
	this->title = title;
	this->price = price;
	this->pages = pages;
}
string Book::getTitle() {
	return title;
}
bool operator <(string str, Book a) {
	if (str.compare(a.title)<0)
		return true;
	else
		return false;
}

int main() {
	Book a("청춘", 20000, 300);
	string b;
	cout << "책 이름을 입력하세요>>";
	getline(cin, b);
	if (b < a)
		cout << a.getTitle() << "이 " << b << "보다 뒤에 있구나!" << endl;
}

7-5

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(1)

#include <iostream>
#include <string>
using namespace std;

class Color {
	int red;
	int green;
	int blue;
public:
	Color();
	Color(int red, int green, int blue);
		Color operator +(Color a);
		bool operator ==(Color a);
		void show();
};

Color::Color() {
	red = 0;
	green = 0;
	blue = 0;
}

Color::Color(int red, int green, int blue) {
	this->red = red;
	this->green = green;
	this->blue = blue;
}

Color Color::operator +(Color a) {
	red = this->red + a.red;
	green = this->green + a.green;
	blue = this->blue + a.blue;
		return *this;
}

bool Color::operator ==(Color a) {
	if (red == a.red && green == a.green && blue == a.blue)
		return true;
	else return false;
}

void Color::show() {
	cout << red << ' ' << green << ' ' << blue << endl;
}

int main() {
	Color red(255, 0, 0), blue(0, 0, 255), c;
	c = red + blue;
	c.show();

	Color fuchsia(255, 0, 255);
	if (c == fuchsia)
		cout << "보라색 맞음";
	else
		cout << "보라색 아님";
}

(2)

#include <iostream>
#include <string>
using namespace std;

class Color {
	int red;
	int green;
	int blue;
public:
	Color() : Color(0, 0, 0) {};
	Color(int red, int green, int blue);
	friend Color operator +(Color a, Color b);
	friend bool operator ==(Color a, Color b);
	void show();
};

Color::Color(int red, int green, int blue) {
	this->red = red;
	this->green = green;
	this->blue = blue;
}

Color operator +(Color a, Color b) {
	Color tmp;
	tmp.red = a.red + b.red;
	tmp.green = a.green + b.green;
	tmp.blue = a.blue + b.blue;
	return tmp;
}

bool operator ==(Color a, Color b) {
	if (a.red == b.red && a.green == b.green && a.blue == b.blue)
		return true;
	else return false;
}

void Color::show() {
	cout << red << ' ' << green << ' ' << blue << endl;
}

int main() {
	Color red(255, 0, 0), blue(0, 0, 255), c;
	c = red + blue;
	c.show();

	Color fuchsia(255, 0, 255);
	if (c == fuchsia)
		cout << "보라색 맞음";
	else
		cout << "보라색 아님";
}

7-6

#include <iostream>
#include <string>
using namespace std;

class Matrix {
	int a;
	int b;
	int c;
	int d;
public:
	Matrix(int a, int b, int c, int d);
	Matrix() : Matrix(0, 0, 0, 0) {};
	void show();
	Matrix operator +(Matrix b);
	Matrix&operator +=(Matrix b);
	bool operator ==(Matrix b);
};

Matrix::Matrix(int a, int b, int c, int d) {
	this->a = a;
	this->b = b;
	this->c = c;
	this->d = d;
}

void Matrix::show() {
	cout << "Matrix = { " << a << ' ' << b << ' ' << c << ' '<<d <<" }"<<endl;
}

Matrix Matrix::operator +(Matrix b) {
	Matrix tmp;
	tmp.a = this->a + b.a;
	tmp.b = this->b + b.b;
	tmp.c = this->c + b.c;
	tmp.d = this->d + b.d;
	return tmp;
}

Matrix& Matrix::operator+=(Matrix b){
	this->a = this->a + b.a;
	this->b = this->b + b.b;
	this->c = this->c + b.c;
	this->d = this->d + b.d;
	return *this;
}
 
bool Matrix::operator ==(Matrix b) {
	if (this->a == b.a && this->b == b.b && this->c == b.c && this->d == b.d)
		return true;
	else
		return false;
}

int main() {
	Matrix a(1, 2, 3, 4), b(2, 3, 4, 5), c;
	c = a + b;
	a += b;
	a.show(); b.show(); c.show();
	if (a == c)
		cout << "a and c are the same" << endl;
}

7-7

7-8

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