discount.cpp

本文是类与对象实验所有内容

#include<iostream.h>
#include"discount.h"
double discount::sum=0.0;
 int discount::n=0;
 double discount::dis=0.98;
discount::discount(int b,double c)
{   
	price=c;
	if(b>=10)                                
    sum=dis*b*price+sum;           
    else 
	sum+=b*price;
	n=b+n;                                 
}
double discount::average(discount&b) //成员函数求每件商品的平均值
{
	double average;
	average=b.sum/b.n;
	return average;
}
void discount::display()  
{
    cout<<"\n***********************";
	cout<<"\n货物的总价是:"<<sum<<endl;
}