/***************************
         Sales_item.h
 ***************************/
#ifndef SALES_ITEM_H_INCLUDED
#define SALES_ITEM_H_INCLUDED
using namespace std;
class Sales_item
{
    public:
    
    Sales_item(): units_sold(0),revenue(0.0) {};
    Sales_item(string,unsigned,double);
    void printInfo() const;
    void changeInfo(string,unsigned,double);
    
    private:
    
    string date;
    unsigned units_sold;
    double revenue;
};
Sales_item::Sales_item(string pdate,unsigned punits_sold,double prevenue)
{
    date = pdate;
    units_sold = punits_sold;
    revenue = prevenue;
}
void Sales_item::changeInfo(string pdate,unsigned punits_sold,double prevenue)
{
    date = pdate;
    units_sold = punits_sold;
    revenue = prevenue;
}
void Sales_item::printInfo() const
{
    cout<<"日期:"<<date<<"\t售出:"<<units_sold<<"\t收益:"<<revenue<<endl;
}
#endif // SALES_ITEM_H_INCLUDED
/***************************
          main.cpp
 ***************************/
#include <iostream>
#include <cstdlib>
#include "Sales_item.h"
using namespace std;
int main()
{
    Sales_item si("2012-07-19",500,200000.0);
    si.printInfo();
    si.changeInfo("2012-12-22",0,0.0);
    si.printInfo();
    system("pause");
    return 0;
}
二楼图


tab 就是这样啊

第一个类就写得这么标准！我写的第一个类额所有成员都是public的

我恨大写！

话说这不是Primer么

'\t'