062、063、064-C++

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062

#include <iostream> using namespace std;class Box{   public:      // 构造函数定义      Box(double l=2.0, double b=2.0, double h=2.0)      {         cout <<"Constructor called." << endl;         length = l;         breadth = b;         height = h;      }      double Volume()      {         return length * breadth * height;      }      int compare(Box box)      {         return this->Volume() > box.Volume();      }   private:      double length;     // Length of a box      double breadth;    // Breadth of a box      double height;     // Height of a box};int main(void){   Box Box1(3.3, 1.2, 1.5);    // Declare box1   Box Box2(8.5, 6.0, 2.0);    // Declare box2   if(Box1.compare(Box2))   {      cout << "Box2 is smaller than Box1" <<endl;   }   else   {      cout << "Box2 is equal to or larger than Box1" <<endl;   }   return 0;}

063

#include <iostream> using namespace std;class Box{   public:      // 构造函数定义      Box(double l=2.0, double b=2.0, double h=2.0)      {         cout <<"Constructor called." << endl;         length = l;         breadth = b;         height = h;      }      double Volume()      {         return length * breadth * height;      }   private:      double length;     // Length of a box      double breadth;    // Breadth of a box      double height;     // Height of a box};int main(void){   Box Box1(3.3, 1.2, 1.5);    // Declare box1   Box Box2(8.5, 6.0, 2.0);    // Declare box2   Box *ptrBox;                // Declare pointer to a class.   // 保存第一个对象的地址   ptrBox = &Box1;   // 现在尝试使用成员访问运算符来访问成员   cout << "Volume of Box1: " << ptrBox->Volume() << endl;   // 保存第二个对象的地址   ptrBox = &Box2;   // 现在尝试使用成员访问运算符来访问成员   cout << "Volume of Box2: " << ptrBox->Volume() << endl;     return 0;}

064

#include <iostream> using namespace std;class Box{   public:      static int objectCount;      // 构造函数定义      Box(double l=2.0, double b=2.0, double h=2.0)      {         cout <<"Constructor called." << endl;         length = l;         breadth = b;         height = h;         // 每次创建对象时增加 1         objectCount++;      }      double Volume()      {         return length * breadth * height;      }   private:      double length;     // 长度      double breadth;    // 宽度      double height;     // 高度};// 初始化类 Box 的静态成员int Box::objectCount = 0;int main(void){   Box Box1(3.3, 1.2, 1.5);    // 声明 box1   Box Box2(8.5, 6.0, 2.0);    // 声明 box2   // 输出对象的总数   cout << "Total objects: " << Box::objectCount << endl;   return 0;}

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