1 #include <iostream>
  2 #include <string.h>
  3 class Stock{
  4 private:
  5    char m_company[30];
  6    int m_stock_num;
  7    float m_stock_price;
  8    float total_price;
  9    float stock_sum(){total_price= m_stock_num*m_stock_price;}
 10
 11 public:
 12    int get_stock(char *company,int stock_num,float stock_price);
 13    void increase(int num,float price);
 14    void sell(int num,float price);
 15    void update_price(float price);
 16    void print_stock_info();
 17    friend Stock plus1(int stock_num,Stock t);
 18    Stock operator+(Stock t);
 19    Stock(char *p,int num,float price);
 20    Stock();
 21    ~Stock();
 22 };
 23
 24 Stock::Stock(char *company,int stock_num,float stock_price)
 25 {
 26    int len=strlen(company);
 27    strncpy(m_company,company,len+1);
 28    m_stock_num=stock_num;
 29    m_stock_price=stock_price;
 30    stock_sum();
 31
 32 }
 33
 34 Stock::Stock()
 35 {
 36    m_stock_num=0;
 37    m_stock_price=0;
 38    stock_sum();
 39    std::cout<<"hello boy"<<std::endl;
 40 }
 41
 42 Stock::~Stock()
 43 {
 44    std::cout<<"good bye"<<std::endl;
 45
 46 }
 47
 48 Stock plus1(int stock_num,Stock t)
 49 {
 50    Stock total;
 51    total.m_stock_num=stock_num+t.m_stock_num;
 52    return total;
 53
 54 }
 55
 56
 57 inline Stock Stock::operator+(Stock t)
 58 {
 59    Stock total;
 60    total.m_stock_num=m_stock_num+t.m_stock_num;
 61    total.total_price=total_price+t.total_price;
 62    return total;
 63 }
 64
 65 inline int Stock::get_stock(char * company,int stock_num,float stock_price)
 66 {
 67    int len=strlen(company);
 68    if (len>30)
 69       return false;
 70    strncpy(m_company,company,len+1);
 71    m_stock_num=stock_num;
 72    m_stock_price=stock_price;
 73    stock_sum();
 74    return true;
 75 }
 76
 77 void Stock::increase(int num,float price)
 78 {
 79    m_stock_num=m_stock_num+num;
 80    m_stock_price=price;
 81    stock_sum();
 82 }
 83
 84 void Stock::sell(int num,float price)
 85 {
 86    if(num>m_stock_num)
 87       m_stock_num=0;
 88    else
 89       m_stock_num=m_stock_num-num;
 90
 91    m_stock_price=price;
 92    stock_sum();
 93 }
 94 void Stock::update_price(float price)
 95 {
 96    m_stock_price=price;
 97
 98 }
 99 void Stock::print_stock_info()
100 {
101    std::cout<<m_stock_num<<std::endl;
102    std::cout<<total_price<<std::endl;
103 }

 1 #include "stock.h"
 2 #include <iostream>
 3 #include <cstring>
 4 using namespace std;
 5 int main()
 6  {
 7    char *p;
 8    p=new char[100];
 9    strcpy(p,"baidu");
10    Stock object[4];
11    object[0].get_stock(p,100,2.3);
12    object[1].get_stock(p,100,2.3);
13    object[2]=object[0]+object[1];
14    object[2].print_stock_info();
15    object[3]=plus1(100,object[2]);
16    object[3].print_stock_info();
17    return true;
18
19  }