[C++] 명품 C++ 프로그래밍 4장

1번

#include<iostream>
using namespace std;

class Color {
	int red, green, blue;
	public:
		Color(){
			red = green = blue = 0;
		}
		Color(int r, int g, int b){
			red = r;
			green = g;
			blue = b;
		}
		void setColor(int r, int g, int b){
			red = r;
			green = g;
			blue = b;
		}
		void show(){
			cout << red << ' ' << green << ' ' << blue << endl;
		}
};

int main(){
	Color screenColor(255, 0, 0);
	Color *p;
	p = &screenColor;
	p->show();
	Color colors[3];
	p = colors;

	p[0].setColor(255, 0, 0);
	p[1].setColor(0, 255, 0);
	p[2].setColor(0, 0, 255);

	for(int i = 0; i <3; i++){
		p[i].show();
	}
}

1번

 

2번

#include<iostream>
using namespace std;

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

2번

 

3-1번

#include<iostream>
using namespace std;

int main(){
	cout << "문자열 입력 >> ";
	string str;
	getline(cin, str);
	int cnt = 0;
	for(int i = 0; i < str.length(); i++){
		if(str[i] == 'a')
			cnt++;
	}
	cout << "문자 a는 " << cnt << "개 있습니다.";
}

3-1번

 

3-2번

#include<iostream>
using namespace std;

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

3-2번

 

4번

#include<iostream>
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();
};
void Sample::read(){
	for(int i = 0; i < size; i++){
		cin >> p[i];
	}
	cout << endl;
}
void Sample::write(){
	for(int i = 0; i < size; i++){
		cout << p[i] << " ";
	}
	cout << endl;
}
int Sample::big(){
	int big = p[0];
	for(int i = 0; i < size; i++){
		if(big < p[i]){
			big = p[i];
		}
	}
	return big;
}
Sample::~Sample(){
	
}

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

4번

 

5번

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

int main(){
	string str;
	
	while(1){
		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;
	}
}

5번

 

6번

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

int main(){
	string str;
	
	while(1){
		getline(cin, str);
		if(str.compare("exit") == 0) break;

		for(int i = str.length() - 1; i >= 0; i--){
			cout << str[i];
		}
		cout << endl;
	}
}

6번

 

7번

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

class Circle{
	int radius;
	public:
		void setRadius(int radius);
		double getArea();
};
void Circle::setRadius(int radius){
	this->radius = radius;
}
double Circle::getArea(){
	return 3.14 * radius * radius;
}

int main(){
	Circle circles[3];
	int cnt = 0;
	for(int i = 0; i < 3; i++){
		int r;
		cout << "원 "  << i + 1 << "의 반지름 >> ";
		cin >> r;
		circles[i].setRadius(r);

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

7번

 

 

8번

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

class Circle{
	int radius;
	public:
		void setRadius(int radius);
		double getArea();
};
void Circle::setRadius(int radius){
	this->radius = radius;
}
double Circle::getArea(){
	return 3.14 * radius * radius;
}

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

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

8번

 

9번

#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);
};
Person::Person(){

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

int main(){
	cout << "이름과 전화번호를 입력해주세요." << endl;
	Person p [3];
	for(int i = 0; i < 3; i++){
		string temp1, temp2;
		cout << "사람 "<< i + 1 << " >>";
		cin >> temp1 >> temp2;
		p[i].set(temp1, temp2);
	}
	cout << "모든 사람의 이름은 ";
	for(int i = 0; i < 3; i++){
		cout << p[i].getName() << " ";
	}
	cout << endl;
	cout << "전화번호를 검색합니다. 이름을 입력하세요 >>";
	string str;
	cin >> str;
	for(int i = 0; i < 3; i++){
		if(str.compare(p[i].getName()) == 0){
			cout << "전화번호는 " << p[i].getTel();
			break;
		}
	}
}

9번

 

10번

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

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;
public:
	Family(string name, int size);
	void show();
	void setName(int index, string name) { p[index].setName(name); }
	~Family();
};

Family::Family(string name, int size) {
	p = new Person[size];
	this->familyName = name;
	this->size = size;
}
void Family::show() {
	cout << familyName << "가족은 다음과 같이 " << size << "명 입니다." << endl;
	for (int i = 0; i < size; i++) {
		cout << p[i].getName() << '\t';
	}
	cout << endl;
}
Family::~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;
	return 0;
}

10번

 

11번

#include <iostream>
#include <string>

using namespace std;

class Container {
	int size;
	public:
		Container(){
			size = 10;
		}
		void fill(){size = 10;};
		void consume(){size -= 1;};
		int getSize(){return size; };
};

class CoffeeVendingMachine {
	Container tong[3];
	void fill();
	void selectEspresso();
	void selectAmericano();
	void selectSugarCoffee();
	void show();
	public:
		void run();
};

void CoffeeVendingMachine::fill(){
	tong[0].fill();
	tong[1].fill();
	tong[2].fill();
}

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

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

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

void CoffeeVendingMachine::show(){
	cout << "커피: "<< tong[0].getSize() << ", 물: " << tong[1].getSize() << ", 설탕: " << tong[2].getSize();
}

void CoffeeVendingMachine::run(){
	cout << "****** 커피 자판기 작동합니다. *****" << endl;
	while(1){
		cout << "메뉴를 눌러주세요(1:에스프레소, 2:아메리카노, 3:설탕커피, 4:잔량보기, 5:채우기)>> ";
		int a;
		cin >> a;
		switch (a)
		{
		case 1:
			selectEspresso();
			cout << "에스프레소 드세요" << endl;
			break;
		case 2:
			selectAmericano();
			cout << "아메리카노 드세요" << endl;
			break;
		case 3:
			selectSugarCoffee();
			cout << "설탕커피 드세요" << endl;
			break;
		case 4:
			show();
			break;
		case 5:
			fill();
			show();
			break;
		

		default:
			break;
		}
	}
}

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

11번

 

12번

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

class Circle{
	int radius;
	string name;
	public:
		void setCircle(string name, int radius);
		double getArea();
		string getName();
};

void Circle::setCircle(string name, int radius){
	this->name = name;
	this->radius = radius;
}

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

string Circle::getName(){
	return name;
}

class CircleManager{
	Circle *p;
	int size;
	public:
		CircleManager(int size);
		~CircleManager(){delete []p;};
		Circle * getCircle() {return p;};
		void searchByName();
		void searchByArea();
};

CircleManager::CircleManager(int size){
	p = new Circle[size];
	this->size = size;
}

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

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

int main(){
	cout << "원의 개수 >> ";
	int temp;
	cin >> temp;
	CircleManager cm(temp);

	for(int i = 0; i < temp; i++){
		string temp1;
		int temp2;
		cout << "원 " << i + 1 << "의 이름과 반지름 >>";
		cin >> temp1 >> temp2;
		cm.getCircle()[i].setCircle(temp1, temp2);
	}
	cm.searchByName();
	cm.searchByArea();
}

12번

 

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

class Histogram{
	string str;
	int spell[26] = {0};
	public:
		Histogram(string str){
			this->str = str;
		};
		void put(string n) {this->str.append(n);};
		void putc(char n) {this->str += n;};
		void print();
		int cntSpell();
};
void Histogram::print(){
	cout << this->str << endl;
	cout << "총 알파벳 수" << cntSpell() << endl;
	for(int i = 'a'; i <= 'z'; i++){
		cout << char(i) << "(" << spell[(int)i - 'a'] << ")\t:";
		for(int j = 0 ; j < spell[(int)i - 'a']; j++){
			cout << "*";
		}
		cout << endl;
	}
}

int Histogram::cntSpell(){
	for(int i = 0; i < str.length(); i++){
		if(str[i] >= 'A' && str[i] <= 'Z'){
			int index = str[i] - 'A';
			spell[index]++;
		}
		if(str[i] >= 'a' && str[i] <= 'z'){
			int index = str[i] - 'a';
			spell[index]++;
		}
	}


	int cnt = 0;
	for(int i = 0; i < str.length(); i++){
		if((str[i] <= 'z' && str[i] >= 'a') || (str[i] <= 'Z' && str[i] >= 'A')){
			cnt++;
		}
	}
	return cnt;
}


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

13번

 

 

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

using namespace std;

class Player {
	int card[3];
	string name;
public:
	Player() :Player("플레이어") { }
	Player(string name) { this->name = name; }
	string getName() { return name; }
	bool playGambling();
};
bool Player::playGambling() {
	for (int i = 0; i < 3; i++) {
		card[i] = rand() % 3;
		cout << "\t" << card[i];
	}
	for (int i = 0; i < 2; i++) {
		if (card[i] != card[i + 1]) {
			return false;
		}
	}
	return true;
}

class GamblingGame {
	Player player[2];
	bool isGameCompleted = false;
public:
	GamblingGame();
	void play();
};

GamblingGame::GamblingGame() {
	cout << "*****갬블링 게임을 시작합니다. *****" << endl;
	string name;
	cout << "첫번째 선수 이름>>";
	cin >> name;
	player[0] = Player(name);
	cout << "두번째 선수 이름>>";
	cin >> name;
	player[1] = Player(name);
	getchar();
}

void GamblingGame::play() {
	int i = 0;
	while (!isGameCompleted) {
		cout << player[i % 2].getName() << ":<Enter>";
		getchar();
		if (player[i % 2].playGambling()) {
			isGameCompleted = true;
			cout << "\t" << player[i % 2].getName() << "님 승리!!" << endl;
		}
		else {
			cout << "\t아쉽군요!" << endl;
		}
		i++;
	}
}

int main() {
	GamblingGame game;
	game.play();
}

14번