类构造函数

// Using a constructor#include <iostream>using std::cout;using std::endl;class CBox // Class definition at global scope{ public: double m_Length; // Length of a box in inches double m_Width; // Width of a box in inches double m_Height; // Height of a box in inches // Constructor definition CBox(double lv, double bv, double hv) { cout << endl << "Constructor called."; m_Length = lv; // Set values of m_Width = bv; // data members m_Height = hv; } // Function to calculate the volume of a box double Volume() { return m_Length* m_Width* m_Height; }};int main(){ CBox box1(78.0,24.0,18.0); // Declare and initialize box1 CBox cigarBox(8.0,5.0,1.0); // Declare and initialize cigarBox double boxVolume = 0.0; // Stores the volume of a box boxVolume = box1.Volume(); // Calculate volume of box1 cout << endl << "Volume of box1 = " << boxVolume; cout << endl << "Volume of cigarBox = " << cigarBox.Volume(); cout << endl; return 0;}