关于showpoint问题

di00di

真的无语了 是编译器问题还是怎么回事呢？
刚刚写了一个程序 使用了showpoint precision  fixed floatfield 但是程序输出并没有显示精度和小数点。。是不是编译器问题呢

bruceteen

直接贴代码得了

di00di

回复 2# bruceteen


#include<iostream>
#include<cstring>

class Stock
{
private:
        char company[30];
        int shares;
        double share_val;
        double total_val;
        void set_tot();
        //{total_val = share_val * shares;};

public:
        Stock();
        Stock(char*co,int n,double pr);
        void acquire(const char*co,int n,double pr);
        void buy(int num,double price);
        void sell(int num,double price);
        void update(double price);
        void show() const;
        const Stock& topval(const Stock & s) const;
};


#include<iostream>
#include"stocks.h"

Stock::Stock()
{
        strcpy(company,"no name");
        shares = 0;
        share_val = 0.0;
        total_val = 0.0;
}
Stock::Stock(char *co,int n,double pr)
{
        strncpy(company,co,29);
   company[29] = '\0';
   if(n<0)
   {
           std::cout << "Numbers of shares can't be negative."
                   << company << " shares set to 0.\n";
           shares = 0;
   }
           else
           {
                   shares = n;
          share_val = pr;
          set_tot();
           }
}
void Stock::set_tot()
{total_val = shares * share_val;}
void Stock::acquire(const char* co,int n,double pr)
{
        strncpy(company,co,29);
   company[29] = '\0';
   if(n<0)
   {
           std::cout << "Numbers of shares can't be negative."
                   << company << " shares set to 0.\n";
           shares = 0;
   }
           else
           {
                   shares = n;
          share_val = pr;
          set_tot();
           }
}

void Stock::buy(int num,double price)
{
        if(num < 0)
        {
                std::cerr << "Number of shares purchaesd can't be negative. "
                        "Transaction is aborted.\n";
        }
        else
        {
                shares += num;
                share_val = price;
                set_tot();
        }
       
}

void Stock::sell(int num,double price)
{
        using std::cerr;
        if(num > shares)
        {
                cerr << "You can't sell more than you have ! "
                        << "Transcation is aborted.\n";
        } else if(num < 0)
        {
                cerr << "Number of shares sold can't be negative."
                        << "Transaction is absorted.\n";
        }
        else
        {
                shares -= num;
                share_val = price;
                set_tot();
        }
}

void Stock::update(double price)
{
        share_val = price;
        set_tot();
}

void Stock::show()const
{
        using std::cout;
        using std::endl;
  cout << "Company: " << company << endl;
  cout << "Shares: " << shares << endl;
  cout << "Share price: $" << share_val << endl;
  cout << "Total worth: $" << total_val << endl;
}

const Stock& Stock::topval(const Stock& s)const
{
        if(s.total_val>total_val)
                return s;
        else return *this;
}

#include<iostream>
#include"stocks.h"

const int STKS = 4;
int main()
{
        using std::cout ;
        using std::ios;
       
        Stock stocks[STKS] =
        {
                Stock("NanoSmart",12,20.0),
                Stock("Boffo Objects",200,2.0),
                Stock("Monolithic",130,3.25),
                Stock("Fleep Enterprises",60,6.5)
        };
        cout.precision(2);
//        cout.setf(ios::fixed|ios::floatfield);
//        cout.setf(ios::showpoint);
        cout << "Stock hodings:\n";
        int st;
        for(st=0;st<STKS;st++)
                stocks[st].show();
        Stock top = stocks[0];
        for(st=1;st<STKS;st++)
                top = top.topval(stocks[st]);
        cout << "\nMost valuable holding:\n";
        top.show();
   

        return 0;
}

bruceteen

你的代码太长了，我看不了

di00di

回复 4# bruceteen


    感觉一定是编译器问题了 我用的vc6.0

bruceteen

cout.setf(ios::fixed|ios::floatfield);
应该是
cout.setf( ios::fixed, ios::floatfield );