명품 C++ 프로그래밍 4장 연습문제

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

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4-1

#include <iostream>
using namespace std;

int main()
{
	int *p = new int[5];
	int sum = 0;
	double m=0.0;
	cout << "정수 5개 입력>> ";
	for (int i = 0; i < 5; i++)
	{
		cin >> p[i];
		sum += p[i];
	}
	m = (double)sum / 5;
	cout << "평균 " << m << endl;
	delete[] p;
	
}

4-2

4-3

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

int main()
{
	string str;
	int cnt = 0, ind = 0;
	cout << "문자열 입력>> ";
	getline(cin, str);
	while(true)
	{
		ind = str.find('a', ind+1);
		if (ind == -1)
			break;
		else
			cnt++;
	}
	cout << "문자 a는 " << cnt << "개 있습니다." << endl;

}

4-4

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

class Sample
{
	int* p;
	int size;
public:
	Sample(int n)
	{
		size = n;
		p = new int[n];
	}
	void read();
	void write();
	int big();
	~Sample();
};

int main()
{
	Sample s(10);
	s.read();
	s.write();
	cout << "가장 큰 수는 " << s.big() << endl;
}

void Sample::read()
{
	for (int i = 0; i <size; i++)
	{
		cin >> p[i];
	}
}

void Sample::write()
{
	for (int i=0; i < size; i++)
	{
		cout << p[i] << ' ';
	}
	cout << endl;
}

int Sample::big()
{
	int ind = 0;
	for (int i = 0; i < size; i++)
	{
		if (ind < p[i])
			ind = p[i];
	}
	return ind;
}
Sample::~Sample()
{

}

4-5

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

int main()
{
	string str;
	cout << "아래에 한 줄을 입력하세요.(exit를 입력하면 종료합니다)" << endl;
	while(true)
	{
		
		cout << ">>";
		getline(cin, str);
		if (str.compare("exit") == 0)break;

		srand((unsigned)time(0));
		int n = rand() % (str.length());

		srand((unsigned)time(0));
		char ch = 'a' + rand() % 26;
		str[n] = ch;
		cout << str << endl;
	}
}

4-6

#include <iostream>
#include <string>
#include <ctime>
#include <cstdlib>

using namespace std;

int main() {
	string str;
	cout << "아래에 한 줄을 입력하세요.(exit를 입력하면 종료합니다)" << endl;
	while (true) {
		cout << ">>";
		getline(cin, str);
		if (str.compare("exit") == 0) break;

		for (int i = str.length(); i >= 0; i--)
		{
			cout << str[i];
		}
		cout << endl;

	}
	return 0;
}

4-7

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

class Circle {
	int radius;

public:
	void setRadius(int radius);
	double getArea();
};

int main()
{
	int r1, r2, r3;
	Circle circles[3];
	cout << "원 1의 반지름 >> ";
	cin >> r1;
	circles[0].setRadius(r1);
	cout << "원 2의 반지름 >> ";
	cin >> r2;
	circles[1].setRadius(r2);
	cout << "원 3의 반지름 >>";
	cin >> r3;
	circles[2].setRadius(r3);

	int cnt = 0;
	for(int i=0;i<3;i++)
	{
		if (circles[i].getArea() > 100)
			cnt++;
	}
	cout << "면적이 100보다 큰 원은 " << cnt << "개 입니다" << endl;

}

void Circle::setRadius(int radius)
{
	this->radius = radius;
}

double Circle::getArea()
{
	return 3.14 * radius * radius;
}

4-8

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

class Circle {
	int radius;

public:
	void setRadius(int radius);
	double getArea();
};

int main()
{
	int r;
	int n;
	int cnt = 0;
	cout << "원의 개수 >> ";
	cin >> n;
	Circle* p = new Circle[n];
	for (int i = 0; i < n; i++)
	{
		cout << "원 " << i+1 << "의 반지름 >> ";
		cin >> r;
		p[i].setRadius(r);

		if (p[i].getArea() > 100)
			cnt++;
	}
	cout << "면적이 100보다 큰 원은 " << cnt << "개 입니다" << endl;

}

void Circle::setRadius(int radius)
{
	this->radius = radius;
}

double Circle::getArea()
{
	return 3.14 * radius * radius;
}

4-9

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

class Person {
	string name;
	string tel;
public:
	Person();
	string getName() { return name; }
	string getTel() { return tel; }
	void set(string name, string tel);
};

int main()
{
	Person people[3];
	string name;
	string tel;
	cout << "이름과 전화 번호를 입력해 주세요" << endl;
	for (int i = 0; i < 3; i++)
	{
		cout << "사람 " << i + 1 << ">> ";
		cin >> name >> tel;
		people[i].set(name, tel);
	}
	cout << "모든 사람의 이름은 ";
	for (int i = 0; i < 3; i++)
		{
		cout<<people[i].getName() << ' ';
		}
	cout<< endl;
	cout << "전화번호 검색합니다. 이름을 입력하세요>>";
	string str;
	cin >> str;
	/*switch (str)
	{
	case '스폰지밥':
		cout << "전화 번호는 " << people[0].getTel();
	case '뚱이':
		cout << "전화 번호는 " << people[1].getTel();
	case '징징이':
		cout << "전화 번호는 "<<people[2].getTel();
	}스위치문 쓰지 말기. */
	for (int i = 0; i < 3; i++)
	{
		if(str.compare(people[i].getName())==0)
		{ 
			cout << "전화 번호는 " << people[i].getTel() << endl;
			break;
		}
	}
}

Person::Person()
{

}

void Person::set(string name, string tel)
{
	this->name = name;
	this->tel = tel;
}

4-10

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

class Person {
	string name;
public:
	Person();
	Person(string name) { this->name = name; }
	string getName() { return name; }
	void setName(string name) { this->name = name; }
};

class Family {
	Person *p;
	string familyName;
	int size = 0;
public:
	Family(string name, int size);
	void show();
	void setName(int index, string name) { p[index].setName(name); }
	~Family() { delete[]p; }

};
int main()
{
		Family *simpson = new Family("Simpson",3);
		simpson->setName(0, "Mr.Simpson");
		simpson->setName(1, "Mrs.Simpson");
		simpson->setName(2, "Bart Simpson");
		simpson->show();
		delete simpson;
}

Person::Person()
{

}
Family::Family(string name, int size)
{
	p = new Person[size];
	this->familyName = name;
	this->size = size;
}

void Family::show()
{
	cout << "Simpson가족은 다음과 같이 " << size << "명입니다." << endl;
	for (int i = 0; i < size; i++)
	{
		cout << p[i].getName() << '\t';
	}
	cout << endl;
}

4-11

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

class CoffeeVendingMachine { //커피자판기를 표현하는 클래스
	Container tong[3]; //tong[o]은 커피, tong[1]은 물, tong[2]는 설탕통을 나타냄
	void fill(); //3개의 통을 모두 10으로 채움
	void selectEspresso();//에스프레소를 선택한 경우, 커피1, 물 1 소모
	void selectAmericano(); //아메리카노를 선택한 경우, 커피1, 물 2 소모
	void selectSugarCoffee();//설탕커피를 선택한 경우, 커피 1, 물2, 설탕 1 소모
	void show(); //현재 커피, 물, 설탕의 잔량 출력
public:
	void run();//커피 자판기 작동
};

class Container {//통 하나를 나타내는 클래스
	int size;//현재 저장 량, 최대 저장량은 10
public:
	Container() { size = 10; }
	void fill() { size = 10; }
	void consume() {size -= 1;}
	int getSize() { return size; }
};

void CoffeeVendingMachine::fill()
{
	for (int i = 0; i < 3; i++)
	{
		tong[i].fill();
	}
	show();
}

void CoffeeVendingMachine::selectEspresso()
{
	if (tong[0].getSize() >= 1 && tong[1].getSize() >= 1)
	{
		tong[0].consume();
		tong[1].consume();
		cout << "에스프레소 드세요" << endl;
	}
	else
	{
		cout << "원료가 부족합니다." << endl;
	}
}

void CoffeeVendingMachine::selectAmericano()
{
	if (tong[0].getSize() >= 1 && tong[1].getSize() >= 2)
	{
		tong[0].consume();
		tong[1].consume();
		tong[1].consume();
		cout << "아메리카노 드세요" << endl;
	}
	else
	{
		cout << "원료가 부족합니다." << endl;
	}
}

void CoffeeVendingMachine::selectSugarCoffee()
{
	if (tong[0].getSize() >= 1 && tong[1].getSize() >= 2 && tong[2].getSize() >= 1)
	{
		tong[0].consume();
		tong[1].consume();
		tong[1].consume();
		tong[2].consume();
		cout << "아메리카노 드세요" << endl;
	}
	else
	{
		cout << "원료가 부족합니다." << endl;
	}
}

void CoffeeVendingMachine::show()
{
	cout << "커피 " << tong[0].getSize() << ", 물 " << tong[1].getSize() << ", 설탕 " << tong[2].getSize() << endl;
}
void CoffeeVendingMachine::run()
{
	cout << "***** 커피자판기를 작동합니다. *****" << endl;
	while (true)
	{
		int menu;
		cout << "메뉴를 눌러주세요(1:에스프레소, 2:아메리카노, 3:설탕커피, 4:잔량보기, 5:채우기)>>";
		cin >> menu;
		switch (menu) {
		case 1:
			selectEspresso();
			break;
		case 2:
			selectAmericano();
			break;
		case 3:
			selectSugarCoffee();
			break;
		case 4:
			show();
			break;
		case 5:
			fill();
			break;
		default:
			break;
		}
	}
}

int main()
{
	CoffeeVendingMachine coffeeVendingMachine;
	coffeeVendingMachine.run();
}

4-12

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

class Circle {
	int radius;
	string name;
public:
	void setCircle(string name, int radius) { this->name = name; this->radius = radius; }
	double getArea() { return 3.14 * radius * radius; }
	string getName() { return name; }
};

class CircleManager {
	Circle *p;
	int size;
public:
	CircleManager(int size) { this->size = size; p = new Circle[size]; }
	~CircleManager() { delete [] p; }
	Circle* getCircle() { return p; } //이걸 추가해야함.
	void searchByName();
	void searchByArea();
};

void CircleManager::searchByName()
{
	cout << "검색하고자 하는 원의 이름 >> ";
	string name;
	cin >> name;
	for (int i = 0; i <size; i++) //num이 아니라 size로 하면 됨.
	{
		if (p[i].getName() == name) {
			cout << p[i].getName() << "의 면적은 " << p[i].getArea() << endl;
			break;
		}
	}
}

void CircleManager::searchByArea()
{
	cout << "최소 면적을 정수로 입력하세요 >> ";
	int area;
	cin >> area;
	cout << area << "보다 큰 원을 검색합니다." << endl;
	for (int i = 0; i < size; i++) //num이 아니라 size로 하면됨
	{
		if (p[i].getArea() > area)
			cout << p[i].getName() << "의 면적은 " << p[i].getArea() << ",";
	}
	cout << endl;
}

int main()
{
	int num;
	cout << "원의 개수 >> ";
	cin >> num;
	CircleManager circles(num);
	for (int i = 0; i < num; i++)
	{
		cout << "원 " << i + 1 << "의 이름과 반지름 >> ";
		string name;
		int radius;
		cin >> name >> radius;
	circles.getCircle()[i].setCircle(name, radius); //p[i]로 직접적으로 쓸 수 없음.
	}
	circles.searchByName();
	circles.searchByArea();
	


}

4-13

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

class Histogram
{
	//int cnt = 0;
	string str;
	int alphabet[26] = { 0 };
public:
	Histogram(string str) { this->str = str; };
	void put(string str) { this->str += str; };
	void putc(char ch) { this->str += ch; };
	void print(); 
	int getAlphabetSize();
	void countAlphabet();
};

int Histogram::getAlphabetSize()
{
	int cnt = 0;
	for (int i = 0; i<str.length(); i++)
	{
		str[i] = tolower(str[i]);
		if (str[i] >= 'a' && str[i] <= 'z')
			cnt++;
	}
	return cnt;
}

void Histogram::countAlphabet()
{
	for (int i = 0; i < str.length(); i++)
	{
		if (str[i] >= 'a' && str[i] <= 'z')
		{
			int ind = str[i] - 'a';
			alphabet[ind]++;
		}
	}
}

void Histogram::print()
{
	cout << str << endl << endl;
	cout << "총 알파벳 수 " << getAlphabetSize() << endl << endl;
	countAlphabet();
	char ch = 'a';
	while (ch <= 'z') {
		cout << ch << " (" << alphabet[(int)ch - 'a'] << ")\t:";
		for (int i = 0; i < alphabet[(int)ch - 'a']; i++)
		{
			cout << "*";
		}
		cout << endl;
		ch++;
	}


}
int main()
{
	Histogram elvisHisto("Wise men say, only fools rush in But I can't help,\n");
	elvisHisto.put("falling in love with you");
	elvisHisto.putc('-');
	elvisHisto.put("Elvis Presley");
	elvisHisto.print();

}

4-14

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

class Player
{
	string players[2];
public:
	void setName();
};

class GamblingGame
{
	
};

void Player::setName()
{
	string str;
	cout << "첫번째 선수 이름>>";
	cin >> str;
	this->players[0] = str;
	cout << "두번째 선수 이름>>";
	cin >> str;
	this->players[1] = str;
}


int main()
{
	cout << "***** 갬블링 게임을 시작합니다. *****" << endl;
	Player player;
	player.setName();

}

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