C++ 프로그래밍 vector 관련 질문드려요ㅠㅠ

Question

#include <iostream>

#include <vector>

using namespace std;

class Shape {

protected:

int x, y;

public:

virtual void draw() = 0;

virtual double getArea() {

return 0;

}

};

class Rectangle : public Shape {

int width, height;

public:

Rectangle() {}

virtual ~Rectangle() {}

Rectangle(int x, int y, int width, int height) {

this->x = x;

this->y = y;

this->width = width;

this->height = height;

}

virtual void draw() {

cout << "Rectangle drawn at : (" << x << ", " << y << ")" << endl;

}

virtual double getArea() {

return width * height;

}

};

class Circle : public Shape {

int radius;

public:

Circle() {}

virtual ~Circle() {}

Circle(int x, int y, int radius) {

this->x = x;

this->y = y;

this->radius = radius;

}

virtual void draw() {

cout << "Circle drawn at : (" << x << ", " << y << ")" << endl;

}

virtual double getArea() {

return radius radius 3.14;

}

};

int main() {

vector<Shape*> vShape;

vShape.push_back(new Rectangle(10, 10, 30, 40)); // 10,10 위치에 가로세로 30x40

vShape.push_back(new Circle(30, 30, 5)); // 30,30 위치에 반지름 5인 원

vShape.push_back(new Rectangle(20, 30, 10, 10));

// 여기에 순차 출력 및 면적 총합계 계산 코드를 추가한다

for (auto it = vShape.begin(); it != vShape.end(); it++) {

Shape v = it;

cout << v->draw() << endl;

}

}

제가 여기까지는 해봤는데 메인에서 for 문 여기서 자꾸 막히더라구요..ㅠㅠ

출력결과가

Rectangle: (30, 40) drawn at : (10, 10)
Circle: (5) drawn at : (30, 30)
Rectangle: (10, 10) drawn at : (20, 30)
Total area: 1378.5

이렇게 나와야하는데 방법 좀 알 수 있을까요??

마지막 합계도 알려주시면 감사하겠습니다..ㅠㅠ

Answer 1

[소스 수정]

#include <iostream>

#include <vector>

using namespace std;

class Shape {

protected:

int x, y;

public:

virtual void draw() = 0;

virtual double getArea() {

return 0;

}

};

class Rectangle: public Shape {

int width, height;

public:

Rectangle() {}

virtual ~Rectangle() {}

Rectangle(int x, int y, int width, int height) {

this->x = x;

this->y = y;

this->width = width;

this->height = height;

}

virtual void draw() {

cout << "Rectangle:("<< width <<","<< height <<") drawn at:(" <<x<< "," <<y<< ")" << endl;

}

virtual double getArea() {

return width * height;

}

};

class Circle : public Shape {

int radius;

public:

Circle() {}

virtual ~Circle() {}

Circle(int x, int y, int radius) {

this->x = x;

this->y = y;

this->radius = radius;

}

virtual void draw() {

cout << "Circle:("<<radius<<") drawn at:(" << x << "," << y << ")" << endl;

}

virtual double getArea() {

return radiusradius3.14;//원의면적구하는 공식:반지름반지름pi

}

};

int main() {

vector<Shape*>vShape;

vShape.push_back(new Rectangle(10, 10, 30, 40));//10,10 위치에 가로세로 30x40

vShape.push_back(new Circle(30, 30, 5));//30,30 위치에 반지름 5인원

vShape.push_back(new Rectangle(20, 30, 10,10));//20,30 위치에 가로세로 10x10

//여기에 순차 출력및 면적 총합계 계산 코드를 추가한다.

double getAreaTotal = 0.;

for (auto it = vShape.begin(); it != vShape.end();it++) {

Shape v = it;

v->draw();

getAreaTotal += v->getArea();

}

cout << "Total area:" << getAreaTotal << endl;

system("pause");

return 0;

}

/*

* 출력 결과가

* Rectangle:(30,40) drawn at:(10,10)

* Circle:(5) drawn at:(30,30)

* Rectangle:(10,10) drawn at:(20,30)

* Total area: 1378.5

*/

[실행결과 캡쳐]