[C++] 명품 C++ 프로그래밍 3장

1번

#include<iostream>
using namespace std;

class Tower{
		int height;
	public:
		Tower();
		Tower(int a);
		int getHeight();
};
Tower::Tower(){
	height = 1;
}
Tower::Tower(int a){
	height = a;
}
int Tower::getHeight(){
	return height;
}


int main() 
{
	Tower myTower;
	Tower seoulTower(100);
	cout << "높이는 " << myTower.getHeight() << "미터" << endl;
	cout << "높이는 " << seoulTower.getHeight() << "미터" << endl;
}

1번

 

2번

#include<iostream>
using namespace std;

class Date{
		int year;
		int month;
		int day;
	public:
		Date(int a, int b, int c);
		Date(string str);
		void show();
		int getYear();
		int getMonth();
		int getDay();
};
Date::Date(int a, int b, int c){
	year = a;
	month = b;
	day = c;
}
Date::Date(string str){
	year = stoi(str);
	month = stoi(str.substr(5,6));
	day = stoi(str.substr(7,9));
}
void Date::show(){
	cout << year << "년" << month << "월" << day << "일" << endl;
}
int Date::getYear(){
	return year;
}
int Date::getMonth(){
	return month;
}
int Date::getDay(){
	return day;
}

int main() 
{
	Date birth(2014, 3, 20);
	Date independenceDay("1945/8/15");
	independenceDay.show();
	cout << birth.getYear() << ", " << birth.getMonth() << ", " << birth.getDay() << endl;
}

2번

 

3번

#include<iostream>
using namespace std;

class Account{
		int money;
		string name;
		int id;
	public:
		Account(string a, int b, int c);
		void deposit(int a);
		string getOwner();
		int inquiry();
		int withdraw(int a);
};
Account::Account(string a, int b, int c){
	name = a;
	money = c; 
	id = b;
}
void Account::deposit(int a){
	money += a;
}
int Account::withdraw(int a){
	money -= a;
	return money;
}
string Account::getOwner(){
	return name;
}
int Account::inquiry(){
	return money;
}

int main() 
{
	Account a("Kitae" , 1, 5000);
	a.deposit(50000);
	cout << a.getOwner() << "의 잔액은 " << a.inquiry() << endl;
	int money = a.withdraw(20000);
	cout << a.getOwner() << "의 잔액은 " << a.inquiry() << endl;
}

3번

 

4번

#include<iostream>
using namespace std;

class CoffeeMachine{
		int water;
		int coffee;
		int sugar;
	public:
		CoffeeMachine(int a, int b, int c);
		void drinkEspresso();
		void drinkAmericano();
		void drinkSugerCoffee();
		void fill();
		void show();
};
CoffeeMachine::CoffeeMachine(int a, int b, int c){
	coffee = a;
	water = b; 
	sugar = c; 
}
void CoffeeMachine::drinkEspresso(){
	coffee -= 1;
	water -= 1;
}
void CoffeeMachine::drinkAmericano(){
	coffee -= 1;
	water -= 2;
}
void CoffeeMachine::drinkSugerCoffee(){
	coffee -= 1;
	water -= 2;
	sugar -= 1;
}
void CoffeeMachine::show(){
	cout << "커피 마신 상태, 커피:" << coffee << "  물:" << water << "  설탕:" << sugar << endl;
}
void CoffeeMachine::fill(){
	water = 10;
	sugar = 10;
	coffee = 10;
}


int main() 
{
	CoffeeMachine java(5, 10, 3);
	java.drinkEspresso();
	java.show();
	java.drinkAmericano();
	java.show();
	java.drinkSugerCoffee();
	java.show();
	java.fill();
	java.show();
	return 0;
}

4번

 

5번

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

class Random{
	public:
		int next();
		int nextInRange(int a, int b);
};
int Random::next(){
	int n = rand();
	return n;
}
int Random::nextInRange(int a, int b){
	int n = rand() % (b - a + 1) + a;
	return n;
}


int main() 
{
	Random r;
	cout << "-- 0에서 " << RAND_MAX << "까지의 정수 10개--" << endl;
	for (int i = 0; i < 10; i++) {
		int n = r.next();
		cout << n << ' ';
	}
	cout << endl << endl << "-- 2에서 4까지의 랜덤 정수 10개 --" << endl;
	for (int i = 0; i < 10; i++) {
		int n = r.nextInRange(2, 4);
		cout << n << ' ';
	}
	cout << endl;
	return 0;
}

5번

 

6번

#include<iostream>
#include <cstdlib>
#include <ctime>
using namespace std;

class EvenRandom{
	public:
		int next();
		int nextInRange(int a, int b);
};
int EvenRandom::next(){
	while(1){
		int n = rand();
		if(n % 2 == 0){
			return n;
		}
	}
}
int EvenRandom::nextInRange(int a, int b){
	while(1){
		int n = rand() % (b - a + 1) + a;
		if(n % 2 == 0){
			return n;
		}
	}
}


int main() 
{
	EvenRandom r;
	cout << "-- 0에서 " << RAND_MAX << "까지의 정수 10개--" << endl;
	for (int i = 0; i < 10; i++) {
		int n = r.next();
		cout << n << ' ';
	}
	cout << endl << endl << "-- 2에서 10까지의 랜덤 정수 10개 --" << endl;
	for (int i = 0; i < 10; i++) {
		int n = r.nextInRange(2, 10);
		cout << n << ' ';
	}
	cout << endl;
	return 0;
}

 

6번

 

7번

#include<iostream>
#include <cstdlib>
#include <ctime>
using namespace std;

class SelectableRandom{
	public:
		int evenNext();
		int oddNextInRange(int a, int b);
};
int SelectableRandom::evenNext(){
	while(1){
		int n = rand();
		if(n % 2 == 0){
			return n;
		}
	}
}
int SelectableRandom::oddNextInRange(int a, int b){
	while(1){
		int n = rand() % (b - a + 1) + a;
		if(n % 2 == 1){
			return n;
		}
	}
}


int main() 
{
	SelectableRandom r;
	cout << "-- 0에서 " << RAND_MAX << "까지의 정수 10개--" << endl;
	for (int i = 0; i < 10; i++) {
		int n = r.evenNext();
		cout << n << ' ';
	}
	cout << endl << endl << "-- 2에서 9까지의 랜덤 정수 10개 --" << endl;
	for (int i = 0; i < 10; i++) {
		int n = r.oddNextInRange(2, 9);
		cout << n << ' ';
	}
	cout << endl;
	return 0;
}

7번

 

8번

#include<iostream>
using namespace std;

class Integer{
	public:
		int n;
		Integer(int a);
		Integer(string a);
		int get();
		void set(int a);
		int isEven();
};
Integer::Integer(int a){
	n = a;
}
Integer::Integer(string a){
	n = stoi(a);
}
int Integer::get(){
	return n;
}
void Integer::set(int a){
	n = a;
}
int Integer::isEven(){
	if(n % 2 == 0) return 1;
	else return 0;
} 


int main() 
{
	Integer n(30);
	cout << n.get() << ' ';
	n.set(50);
	cout << n.get() << ' ';

	Integer m("300");
	cout << m.get() << ' ';
	cout << m.isEven();
}

8번

 

9번

#include<iostream>
using namespace std;

class Oval{
	int width, height;
	public:
		Oval(int a, int b);
		Oval();
		void set(int a, int b);
		void show();
		int getWidth();
		int getHeight();
		~Oval();
};
Oval::Oval(){
	width = 0;
	height = 0;
}
Oval::Oval(int a, int b){
	width = a;
	height = b;
}
void Oval::set(int a, int b){
	width = a;
	height = b;
}
void Oval::show(){
	cout << "width = " << width << ", height = " << height << endl;
}
int Oval::getHeight(){
	return height;
}
int Oval::getWidth(){
	return width;
}
Oval::~Oval(){
	cout << "Oval 소멸 : width = " << width << ", height = " << height << endl;
}

int main() 
{
	Oval a, b(3,4);
	a.set(10, 20);
	a.show();
	cout << b.getWidth() << "," << b.getHeight() << endl;
}

9번

 

10번

#include<iostream>
using namespace std;

class Add{
	int a;
	int b;
	public:
		void setValue(int a, int b){
			this->a = a;
			this->b = b;
		};
		void calculate(){
			cout << a + b << endl;
		};
};

class Sub{
	int a;
	int b;
	public:
		void setValue(int a, int b){
			this->a = a;
			this->b = b;
		};
		void calculate(){
			cout << a - b << endl;
		};
};

class Mul{
	int a;
	int b;
	public:
		void setValue(int a, int b){
			this->a = a;
			this->b = b;
		};
		void calculate(){
			cout << a * b << endl;
		};
};

class Div{
	int a;
	int b;
	public:
		void setValue(int a, int b){
			this->a = a;
			this->b = b;
		};
		void calculate(){
			cout << a / b << endl;
		};
};

int main() 
{
	Add a;
	Sub s;
	Mul m;
	Div d;
	int x, y;
	char z;
	while(1){
		cout << "두 정수와 연산자를 입력하세요>> ";
		cin >> x >> y >> z;
		switch (z)
		{
		case '+':
			a.setValue(x,y);
			a.calculate();
			break;
		case '-':
			s.setValue(x,y);
			s.calculate();
			break;
		case '*':
			m.setValue(x,y);
			m.calculate();
			break;
		case '/':
			d.setValue(x,y);
			d.calculate();
			break;
		default:
			break;
		}
	}
}

10번