// C8_7.cpp : Defines the entry point for the console application.
// 類別中使用靜態成員

#include "stdafx.h"
#include <iostream>
using namespace std;

class CaseBox         // 類別定義
{
   public:
    static int Obj_count;            
    CaseBox(double lv = 3.0, double wv= 3.0, double hv= 3.0)  // 建構子定義
      {
         cout << endl << "呼叫建構子";
         m_L = lv;                      // 設定資料成員
         m_W = wv;                     
         m_H = hv;
         Obj_count++;
      }
    double Area()  // 宣告類別成員函式
      {
         return 2.0 * (m_L*m_W + m_W*m_H + m_L*m_H);
      }
   private:
      double m_L;     //類別資料成員
      double m_W;                     
      double m_H; 

};

int CaseBox::Obj_count = 0;                // Initialize static member of 


int main(int argc, char* argv[])
{
   CaseBox S1(6.0, 6.0 ,6.0);                   // 宣告類別變數
   CaseBox S2(7.2,8.9,6.5);                             
   double area1 = 0.0;
   double area2 = 0.0;                  

// 計算表面積
   area1 = S1.Area();
   area2 = S2.Area();
   cout << endl
        << " S1 表面積 = " << area1 << " 平方公分" ;

   cout << endl
        << " S2 表面積 = " << area2 << " 平方公分\n" ;

   cout << endl 
        << "物件數目 (經由類別) : "
        << CaseBox::Obj_count;
   
   cout << endl
        << "物件數目 (經由物件) : "
        << S1.Obj_count;


   cout << endl        // 顯示佔用記憶體大小
        << "一個 CaseBox 物件佔用 "
        << sizeof S1 << " 位元組。\n";

   cout <<endl;


	return 0;
}