?? booksale.h
字號:
#include<iostream.h>
#include"book.h"
class booksale:public book
{
private:
static float rate; //設置靜態成員稅率rate
static float account; //設置靜態成員銷售總計account
public:
int num; //購買一本書的數量
void setnum(int);
int getnum();
static float getrate(); //返回靜態稅率rate
static void setaccount(float); //使銷售總計account累加
static float getaccount(); //返回靜態稅率account
};
// 靜態成員變量的賦值
float booksale::rate=0.06f;
float booksale::account=0.0f;
void booksale::setnum(int n)
{
num=n;
}
int booksale::getnum()
{
return num;
}
float booksale::getrate() //返回靜態稅率rate
{
return rate;
}
float booksale::getaccount() //返回靜態稅率account
{
return account;
}
void booksale::setaccount(float f) //使銷售總計account累加
{
account+=f;
}
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