sale.h

用C++编写的课程设计

#include "BookData.h"
class	Sale:public BookData
{
private:
	static float taxRate;//税率//
	int qtySold;//销售量//
	float tax;// 本次购买的销售税//
	float subtotal;//应付款项，书款+税款//
	static float total;//所有销售的额//
public:
	static float gettaxRate()
	{
		return taxRate;
	}
	static float gettotal()
	{
		return total;
	}
	void setqtySold(int a)
	{
		qtySold=a;
	}
	int getqtySold()
	{
		return qtySold;
	}
	void caltax()
	{
		tax=taxRate*getRetail()*qtySold;
	}
	void calsubtotal()
	{
		subtotal=getRetail()*qtySold+tax;
	};
	void caltotal()
	{
		total+=subtotal;
	}
};