[어서와 C++는 처음이지!] CH4 Exercise

1

#include <iostream>
#include <string>
#include <stdlib.h>
using namespace std;

class Person {
public:
	string name;
	int age;

	void setPerson(string n, int a) {
		name = n;
		age = a;
	}

	void print() {
		cout << "이름 : " << name << endl;
		cout << "나이 : " << age << endl;
	}
};

int main() {
	Person myPerson;

	myPerson.setPerson("김철수", 21);
	myPerson.print();

	return 0;
}

 

2

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

class Computer {
public:
	string name;
	int RAM;
	double cpu_speed;

	void setComputer(string n, int R, double c_s) {
		name = n;
		RAM = R;
		cpu_speed = c_s;
	}

	void print() {
		cout << "이름: " << name << endl;
		cout << "RAM: " << RAM << endl;
		cout << "CPU 속도: " << cpu_speed << endl;
	}
};

int main() {
	Computer myComputer;

	myComputer.setComputer("오피스컴퓨터", 8, 4.2);
	myComputer.print();

	return 0;
}

 

3

#include <iostream>
using namespace std;

class Sum {
public:
	int n1, n2;

	void init(int x, int y) {
		n1 = x;
		n2 = y;
	}

	int add() {
		return n1 + n2;
	}
};

int main() {
	Sum mySum;

	mySum.init(10, 20);
	cout << "첫 번째 정수: " << mySum.n1 << endl;
	cout << "두 번째 정수: " << mySum.n2 << endl;
	
	cout << "연산 결과: " << mySum.add() << endl;

	return 0;
}

 

4

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

class Book {
public:
	string title, author;
};

int main() {
	Book myBook;
	
	myBook.title = "Great C++";
	myBook.author = "Bob";

	cout << "책 이름: " << myBook.title << endl;
	cout << "책 저자: " << myBook.author << endl;

	return 0;
}

 

6

#include <iostream>
using namespace std;

class Employee {
public:
	string name;
	int age;
	int salary;
};

int main() {
	Employee Employee1;

	Employee1.name = "김철수";
	Employee1.age = 38;
	Employee1.salary = 200000;

	cout << "Employee1:" << endl;
	cout << Employee1.name << endl;
	cout << Employee1.age << endl;
	cout << Employee1.salary << endl;

	return 0;
}

 

7

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

class CellPhone {
public:
	string number;
	string model;
	string color;
	bool state = true;

	void setOn() {
		if (state == true)
			state = false;
		else
			state = true;
	}
};

int main() {
	CellPhone myPhone;

	myPhone.number = "010-1234-5678";
	myPhone.model = "Galaxy";
	myPhone.color = "Black";
	myPhone.state = true;
	myPhone.setOn();

	cout << "CellPhone1:" << endl;
	cout << myPhone.number << endl;
	cout << myPhone.model << endl;
	cout << myPhone.color << endl;
	cout << boolalpha<< myPhone.state << endl;

	return 0;
}

• cout << boolalpha << myPhone.state: 0이 아닌 false로 출력함

 

8

#include <iostream>
using namespace std;

class Complex {
public:
	double r;
	double i;

	void printPlus() {
		cout << r << " + " << i << "i" << endl;
	}

	void printMinus() {
		cout << r << " - " << i << "i" << endl;
	}
};

int main() {
	Complex myC, myC2;
	
	myC.r = 5;
	myC.i = 3;
	myC.printPlus();

	myC2.r = 3;
	myC2.i = 4;
	myC2.printMinus();

	return 0;
}

 

9

#include <iostream>
using namespace std;

class Triangle {
public:
	int b, h;

	int area() {
		return b * h / 2;
	}
};

int main() {
	Triangle myT;
	
	myT.b = 3;
	myT.h = 4;

	cout << "밑변이 " << myT.b << "이고 높이가 " << myT.h << 
		"인 삼각형의 면적: " << myT.area() << endl;

	return 0;
}

 

10

#include <iostream>
using namespace std;

class BankAccount {
public:
	int number;
	int balance;

	void deposit(int m) {
		balance += m;
	}

	void withdraw(int m) {
		balance -= m;
	}
};

int main() {
	BankAccount myB;
	myB.balance = 1000000;
	cout << "현재 잔액: " << myB.balance << endl;

	myB.deposit(1000000);
	cout << "after deposit(1000000) 현재 잔액: " << myB.balance << endl;

	myB.withdraw(1000000);
	cout << "after withdraw(1000000) 현재 잔액: " << myB.balance << endl;

	return 0;
}

 

11

#include <iostream>
using namespace std;

class Box {
public:
	double l;
	double w;
	double h;

	double getV() {
		return l * w * h;
	}
};

int main() {
	Box myBox;
	myBox.l = 6;
	myBox.w = 7;
	myBox.h = 5;

	cout << "[" << myBox.l << "," << myBox.w << "," << myBox.h << "]" << endl;
	cout << "상자의 부피: " << myBox.getV() << endl;

	return 0;
}

 

12

#include <iostream>
using namespace std;

class Time {
public:
	int h, m, s;

	void setTime(int ha, int ma, int sa) {
		h = ha;
		m = ma;
		s = sa;
	}

	void print() {
		cout << h << " : " << m << " : " << s << endl;
	}
};

int main() {
	Time myT;
	myT.setTime(07, 10, 20);
	myT.print();

	return 0;
}