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[C++] 명품 C++ 프로그래밍 11장 실습문제 풀이

Posted
By Keem
8 min read

11장 C++ 입출력 시스템

1번

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#include <iostream>
using namespace std;

int main() {
    int ch;
    int count = 0;
    while ((ch = cin.get()) != EOF) {
        if (ch == 'a')
            count++;
    }
    cout << count << endl;
}

2번

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#include <iostream>
using namespace std;

int main() {
    char ch;
    int count = 0;
    while(true){
    	cin.get(ch);
        if(cin.eof())
        	break;
        if(ch == ' ')
        	count++;
	}
    cout << count << endl;
}

3번

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#include <iostream>
using namespace std;

int main() {
    int ch;
    cin.ignore(100,';');
    while ((ch = cin.get()) != EOF) {
        cout.put(ch);
        if (ch == '\n')
            cin.ignore(100,';');
    }
}

4번

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#include <iostream>
using namespace std;
int main() {
    int ch;
    while ((ch = cin.get()) != EOF) {
        if (ch == ';') {
            cout.put('\n');
            cin.ignore(100, '\n');
        }
        else
            cout.put(ch);
    }
}

5번

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

int main() {
    string cmd;
    while (true) {
        cout << "종료하려면 exit을 입력하세요 >> ";
        getline(cin, cmd);
        if (cmd == "exit") {
            cout << "프로그램을 종료합니다." << endl;
            return 0;
        }
    }
}

6번

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#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;

int main() {
    cout << setw(15) << left << "Number";
    cout << setw(15) << left << "Square";
    cout << setw(15) << left << "Square Root"<<endl;

    cout.fill('_');
    for (int i = 0; i < 45; i += 5) {
        cout << setw(15) << i;
        cout << setw(15) << i * i;
        cout << setw(15) << setprecision(3) <<sqrt(i);
        cout << endl;
    }
}

7번

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

int main() {
    for (int i = 0; i < 4; i++)
        cout << "dec\t" << "hexa\t" << "char\t";
    cout << endl;
    for (int i = 0; i < 4; i++)
        cout << "___\t" << "____\t" << "____\t";
    cout << endl;
    cout.fill(' ');
    for (int i = 0; i < 128; i++) {
        if (i != 0 && i % 4 == 0)
            cout << endl;
        cout << setbase(10) << i << '\t';
        cout << setbase(16) << i << '\t';
        if (isprint(char(i)))
            cout << (char)i << '\t';
        else
            cout << '.' << '\t';
    }
}

8번

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

class Circle {
    string name;
    int radius;
public:
    Circle(int radius = 1, string name = "") {
        this->radius = radius;
        this->name = name;
    }
    friend istream& operator>>(istream& in, Circle& c);
    friend ostream& operator<<(ostream& out, Circle& c);
};
istream& operator>>(istream& in, Circle& c) {
    string name;
    int radius;
    cout << "반지름 >> ";
    in >> radius; in.ignore();
    cout << "이름 >> ";
    in >> name; in.ignore();
    c.name = name;
    c.radius = radius;
    return in;
}
ostream& operator<<(ostream& out, Circle& c) {
    out << "(반지름" << c.radius << "인 " << c.name << ")";
    return out;
}
int main() {
    Circle d, w;
    cin >> d >> w;
    cout << d << w << endl;
}

9번

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

class Phone {
    string name, telnum, address;
public:
    Phone(string name = "", string telnum = "", string address = "") {
        this->name = name;
        this->telnum = telnum;
        this->address = address;
    }
    friend istream& operator>>(istream& in, Phone& p);
    friend ostream& operator<<(ostream& out, Phone& p);
};

istream& operator>>(istream& in, Phone& p) {
    cout << "이름 : ";
    getline(in, p.name);
    cout << "전화번호 : ";
    getline(in, p.telnum);
    cout << "주소 : ";
    getline(in, p.address);
    return in;
}
ostream& operator<<(ostream& out, Phone& p) {
    out << "(" << p.name << ',' << p.telnum << ',' << p.address << ")";
    return out;
}

int main() {
    Phone girl, boy;
    cin >> girl >> boy;
    cout << girl << endl << boy << endl;
}

10번

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

istream& prompt(istream& in) {
    cout << "암호?";
    return in;
}
int main() {
    string password;
    while (true) {
        cin >> prompt >> password;
        if (password == "C++") {
            cout << "login success!" << endl;
            break;
        }
        else
            cout << "login fail. try again!!" << endl;
    }
}

11번

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#include <iostream>
using namespace std;

istream& pos(istream& in) {
    cout << "위치는? ";
    return in;
}
int main() {
    int x, y;
    cin >> pos >> x;
    cin >> pos >> y;
    cout << x << ',' << y << endl;
}

12번

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#include <iostream>
#include <vector>
#include <iomanip>
using namespace std;

class ingredient {
protected:
    int remain = 3;
public:
    virtual void show() {
        for (int i = 0; i < remain; i++)
            cout << '*';
        cout << endl;
    }
    void fill() { remain = 3; }
    void consume() { remain--; }
    bool isConsume() {
        if (remain < 1)
            return false;
        else
            return true;
    }
};

class Coffee : public ingredient {
public:
    virtual void show() override {
        cout << setw(8) << left << "Coffee";
        ingredient::show();
    }
};
class Sugar : public ingredient {
public:
    virtual void show() {
        cout << setw(8) << left << "Sugar";
        ingredient::show();
    }
};
class Cream : public ingredient {
public:
    virtual void show() {
        cout << setw(8) << left << "Cream";
        ingredient::show();
    }
};
class Water : public ingredient {
public:
    virtual void show() {
        cout << setw(8) << left << "Water";
        ingredient::show();
    }
};
class Cup : public ingredient {
public:
    virtual void show() {
        cout << setw(8) << "Cup";
        ingredient::show();
    }
};

class CoffeeMachine {
    vector<ingredient*> ingredientVt;
    int getMenu() {
        int selectMenu;
        cout << "보통 커피:0, 설탕 커피:1, 블랙 커피:2, 채우기:3, 종료:4 >> ";
        cin >> selectMenu;
        return selectMenu;
    }
    void fillAll() {
        cout << "모든 통을 채웁니다~~";
        for (auto& a : ingredientVt)
            a->fill();
        cout << endl;
    }
    void showAll() {
        for (auto& a : ingredientVt)
            a->show();
        cout << endl;
    }
    bool isGetCoffee(int coffee) {
        if (!ingredientVt[0]->isConsume() || !ingredientVt[3]->isConsume() || !ingredientVt[4]->isConsume())
            return false;
        switch (coffee) {
        case 0:
            if (!ingredientVt[2]->isConsume())
                return false;
            else
                ingredientVt[2]->consume();
        case 1:
            if (!ingredientVt[1]->isConsume())
                return false;
            else
                ingredientVt[1]->consume();
            break;
        }
        ingredientVt[0]->consume();
        ingredientVt[3]->consume();
        ingredientVt[4]->consume();
        return true;
    }
    void getCoffee(int coffee, bool flag) {
        if (!flag)
            cout << "재료가 부족합니다." << endl;
        else {
            switch (coffee) {
            case 0:
                cout << "맛있는 보통 커피 나왔습니다~~" << endl;
                break;
            case 1:
                cout << "맛있는 설탕 커피 나왔습니다~~" << endl;
                break;
            case 2:
                cout << "맛있는 블랙 커피 나왔습니다~~" << endl;
                break;

            }
        }
    }
public:
    CoffeeMachine() {
        ingredientVt.push_back(new Coffee());
        ingredientVt.push_back(new Sugar());
        ingredientVt.push_back(new Cream());
        ingredientVt.push_back(new Water());
        ingredientVt.push_back(new Cup());
    }
    void run() {
        cout << "----- 명품 커피 자판기입니다. -----" << endl;
        showAll();
        int coffee;
        bool flag;
        while (true) {
            switch (coffee = getMenu()) {
            case 0: case 1: case 2:
                flag = isGetCoffee(coffee);
                getCoffee(coffee, flag);
                break;
            case 3:
                fillAll();
                break;
            case 4:
                return;
            }
            showAll();
        }
    }
};

int main() {
    CoffeeMachine CM;
    CM.run();
}
c++, 실습문제
c++
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