(열혈 C++ 프로그래밍) 문제 03-2

클래스의 정의

 

 

 

 

 

 

 

문제1

#include <iostream>
using namespace std;

class Calculator
{
private:
	int countAdd, countMin, countMul, countDiv;
public:
	void Init();
	double Add(double, double);
	double Min(double, double);
	double Mul(double, double);
	double Div(double, double);
	void ShowOpCount();
};

inline void Calculator::Init()
{
	countAdd = 0;
	countMin = 0;
	countMul = 0;
	countDiv = 0;
}

inline double Calculator::Add(double a, double b)
{
	countAdd++;
	return a + b;
}

inline double Calculator::Min(double a, double b)
{
	countMin++;
	return a - b;
}

inline double Calculator::Mul(double a, double b)
{
	countMul++;
	return a * b;
}

inline double Calculator::Div(double a, double b)
{
	countDiv++;
	return a / b;
}

inline void Calculator::ShowOpCount()
{
	cout << "덧셈: " << countAdd << " 뺄셈: " << countMin << " 곱셈: " << countMul << " 나눗셈: " << countDiv << endl;
}

int main(void)
{
	Calculator cal;
	cal.Init();
	cout << "3.2 + 2.4 = " << cal.Add(3.2, 2.4) << endl;
	cout << "3.5 / 1.7 = " << cal.Div(3.5, 1.7) << endl;
	cout << "2.2 - 1.5 = " << cal.Min(2.2, 1.5) << endl;
	cout << "4.9 / 1.2 = " << cal.Div(4.9, 1.2) << endl;
	cal.ShowOpCount();

	return 0;
}

문제2

// 책에 있는 답안

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

class Printer
{
private:
    char str[30];
public:
    void SetString(char* s);
    void ShowString();
};

void Printer::SetString(char* s)
{
    strcpy(str, s);
}

void Printer::ShowString()
{
    cout << str << endl;
}

int main(void)
{
    Printer pnt;
    pnt.SetString("Hello world!");
    pnt.ShowString();

    pnt.SetString("I love C++");
    pnt.ShowString();
    return 0;
}

문제2는 책에 있는 답안이랑 똑같이 옮겨적어도 제 컴퓨터에서는 오류가 나네요.. 이유 아시는 분은 댓글 좀..