C++编程难题,急求解答,谢谢!

答案：#include <iostream>
 using namespace std;
  
class Stock
 {
 private:
  char *co_name;
//公司名称
  int shares;
   //持股数
  double share_val;//单股价格
  double total_val;//股值=持股数*单股价格
 public:
  Stock();
  
  //默认构造函数
  Stock(char *co,int sh, double sh_val);
  ~Stock();
  void buy(int num,double price);//买入股票
  void sell(int num,double price);//卖出股票
  void update(double price);
   //更改股价
  void show() const;
  
  
 //输出公司股票信息
  const Stock& topval(const Stock &s) const;//比较两种股票的股值，返回股值大的股票公司
 };
  
Stock::Stock(){}
  
Stock::Stock(char *co,int sh, double sh_val)
 {
  co_name=co;
  shares=sh;
  share_val=sh_val;
  total_val=shares*share_val;
 }
  
Stock::~ Stock(){}
  
void Stock::buy(int num,double price)
 {
  shares=num;
  share_val=price;
  total_val=shares*share_val;
 }
  
void Stock::sell(int num,double price)
 {
  shares=shares-num;
  share_val=price;
  total_val=shares*share_val;
 }
  
void Stock::update(double price)
 {
  share_val=price;
  total_val=shares*share_val;
 }
  
void Stock::show() const
 {
  cout<<"\
The company name of the stock is: "<<co_name<<endl;
  cout<<"The number of shares purchased is: "<<shares<<endl;
  cout<<"The price of single stock is: "<<share_val<<endl;
  cout<<"The total price os the stock is: "<<total_val<<endl<<endl;
 }
  
const Stock& Stock:: topval(const Stock &s) const
 {
  Stock a;
  if(total_val>s.total_val)
  {
   a.co_name=co_name;
   a.shares=shares;
   a.share_val=share_val;
   a.total_val=total_val;
   return a;
  }
  else
   return s;
 }
  
int main()
 {
  Stock stock[3]={Stock("zhongyidong",0,0),Stock("zhongshihua",0,0)};
  char s[2][50]={"zhongyidong","zhongshihua"},c;
  int num,del;
  double price;
  for(int i=0;i<2;i++)
  {
   cout<<"The number of shares purchased in "<<s[i]<<": ";
   cin>>num;
   cout<<"The price of single stock: ";
   cin>>price;
   stock[i].buy(num,price);
   cout<<"Sell the stock? "<<"y/n?"<<endl;
   cin>>c;
   if(c=='y')
   {
    cout<<"Number of shares to be sold: ";
    cin>>num;
    cout<<"Price of shares to be sold: ";
    cin>>price;
    stock[i].sell(num,price);
   }
   cout<<"Update the price of stock? "<<"y/n?"<<endl;
   cin>>c;
   if(c=='y')
   {
    cout<<"Price of the stock: ";
    cin>>price;
    stock[i].update(price);
   }
   }
  cout<<"\
The largest companies in stock value is:\
";
  stock[2]=stock[0].topval(stock[1]);
  stock[2].show();
  return 0;
 }
在说明里阿良

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