privatemen.cpp

C++的一些简单代码 希望能给初学者带来小小的帮助

#include <iostream>
using std::cout;
using std::endl;

class Box{
public:
	//Construtor
	Box(double length=1.0,double width=1.0,double height=1.0);

	//Function to calculate the volume of a box
	double volume(){
		return length*width*height;
	}
	double getlength();
private:
	double length;
	double width;
	double height;
};

    Box::Box(double lvalue,double wvalue,double hvalue):
                                           length(lvalue),width(wvalue),height(hvalue){
	cout<<"Box constructor called"<<endl;
	cout<<lvalue<<" "<<wvalue<<" "<<hvalue<<endl;
	if (length<=0)
		length=1.0;
	if (width<=0)
		width=0;
    if (height<=0)
		height=0;
}
	inline double Box::getlength(){return length;}

void main(){
	Box firstBox(80.0,50.0,40.0);
    cout<<endl;
	/*cout<<"Size of first Box object is "
		<<firstBox.length<<" by "
		<<firstBox.width<<" by "
		<<firstBox.height
		<<endl;*/
	cout<<"Volume of first Box object is "<<firstBox.volume()
		<<endl;

	Box secondBox;
	/*secondBox.length=10.0;
	secondBox.width=5.0;
	secondBox.height=4.0;*/


	cout<<endl;
	/*out<<"Size of first Box object is "
		<<secondBox.length<<" by "
		<<secondBox.width<<" by "
		<<secondBox.height
		<<endl;*/
	cout<<"Volume of second Box object is "<<secondBox.volume()
		<<endl;

	cout<<endl;
	Box* pthirdBox=new Box(15.0,20.0,8.0);
	cout<<endl;
	cout<<"Volume of third Box object is "<<pthirdBox->volume()
		<<endl;
	cout<<pthirdBox->getlength()<<endl;
	delete pthirdBox;
}