用C++商店销售某一件商品,每天公布统一的折扣(discount)。同时允许...

#include<iostream>

using namespace std;

class shop

{

public:

shop(int q=0,double p=0):quantity(q),price(p){};

void total();

static float average();

static float sum;

private:

int quantity;

double price;

static double discount;

static int n;

};

void shop::total()

{

int rate=1.0;

if(quantity>=10)rate=0.98*rate;

sum=sum+price*rate*discount*quantity;

n=n+quantity;

}

float shop::average()

{

return(sum/n);

}

double shop::discount=0.9;

float shop::sum=0;

int shop::n=0;

int main()

{

shop s[3]={shop(5,23.5),

shop(12,24.56),

shop(100,21.5)};

int i;

for(i=0;i<3;i++)

s[i].total();

cout<< 总价是 <<shop::sum<<endl;

cout<< 单价是 <<shop::average()<<endl;

return 0;

}