ch9 3번문제.cpp

#include <iostream>
using namespace std;

class LoopAdder{
    string name;
    int x,y,sum;
    void read();
    void write();
protected:
    LoopAdder(string name=""){this->name = name;}
    int getX(){return this->x;}
    int getY(){return this->y;}
    virtual int calculate()=0;
public:
    void run();
};

void LoopAdder::read(){
    cout << name << ":" << endl;
    cout << "처음 수에서 두번재 수까지 더합니다. 두 수를 입력하세요 >> ";
    cin >> x >> y;
}
void LoopAdder::write(){
    cout << x << "에서 " << y << "까지의 합은 " << sum << "입니다" << endl;
}

void LoopAdder::run(){
    read();
    sum = calculate();
    write();
}

class ForLoopAdder : public LoopAdder{
public:
    ForLoopAdder(string name) : LoopAdder(name){;}
    int calculate();
};

int ForLoopAdder::calculate(){
    int x = getX();
    int y = getY();
    int sum = 0;
    for(int i=x; i<=y; i++)
        sum = sum + i;
    return sum;
}

int main(){
    ForLoopAdder forLoop("For Loop");
    forLoop.run();
    
    return 0;
}