[問題] 關於第2題

[INsoarDEEP (green)]

Compiler跟我說Int main()裡面的Circle::getPerimeter()沒有matching function
但我不會修正，想請大家指點一下，感謝！

這是我的程式碼

#include <iostream>
using namespace std;
class Circle
{public:
       float getPerimeter(float a,int b,int c)
       {cin >> a >> b >> c ;
        cout <<  2*a*3.14;
        }
       float getArea(float a,int b,int c)
       {cin >> a >> b >> c ;
        cout << 3.14*a*a ;
        }

};

class Square
{public:
        float getArea()
        {cin >> d >> e >> f ;
        cout << d*d;
        }
        float getPerimeter()
        {cin >> d >> e >> f ;
         cout << 4*d;
         }
 private:
         float d;
         int e,f;
};

int main()
{
  float r1, r2;
  int x1, y1, x2, y2;
  cout << "Please enter the radius and center coordinates "
       << "for the circle (r/x/y): ";
  cin >> r1 >> x1 >> y1;
  cout << "Please enter the side length and center coordinates "
       << "for the Square (s/x/y): ";
  cin >> r2 >> x2 >> y2;

  Circle c1;
  Square s2;

  float p1 = c1.getPerimeter(), p2 = s2.getPerimeter();
  if (p1 > p2)
              cout << "Circle has larger perimeter (" << p1 << ") than "
                   << "Square(“ << p2 << “)!!" << endl;
  else
              cout << "Circle has smaller perimeter (“ << p1 << “) than "
                   << "Square(“ << p2 << “)!!" << endl;
  float a1 = c1.getArea(), a2 = s2.getArea();
  if (a1 > a2)
              cout << "Circle has larger area (“ << a1 << “) than "
                   << "Square(“ << a2 << “)!!" << endl;
  else
              cout << "Circle has smaller area (“ << a1 << “) than "
                   << "Square(“ << a2 << “)!!" << endl;
  return 0;
  system ("pause");
}


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◆ From: 140.112.236.234
推 AlanLee76083:float getarea 沒有return值
推 ilway25:"getxxx" function 的意思你有點搞錯了~
→ ilway25:恩還有constructor
推 INsoarDEEP:可以麻煩大大解釋一下嗎？我真的不太懂
推 ilway25:去翻翻老師上課講義弄懂每一行吧..這很難用一兩行字道盡..
→ ilway25:還有你把老師給的程式碼改了...
推 ally01202:getXXX的函數基本上沒有輸入值
→ ally01202:所以要用constructer 直接從class裡把變數拿來運算
推 nicksxz:補充一點  相同的data不需要重複輸入
→ nicksxz:所以有些cin是不需要的
→ nicksxz:另外就是cout和return是不一樣的  要分清楚
推 ric2k1:嗯, 除了以上各位的回答之外, 簡單的說, 就是你
→ ric2k1:Circle::getPerimeter() 不用傳參數, 而是用 constructor
→ ric2k1:被呼叫時存入的 data members 就好了 (好像跟上面的人說的
→ ric2k1:一樣...)
推 INsoarDEEP:感謝大家的指點，我成功COMPILE，程式也能順利跑了，
→ INsoarDEEP:原來是有好多基本概念都不清楚，我要加把勁了