关于书店的一个小程序，c++写的。.大家帮忙看看怎么运行不了？？？

 #include <iostream>
#include <sstream>

using namespace std;
class Sales_data
{
    friend std::istream& operator>>(std::istream&, Sales_data&);
    friend std::ostream& operator<<(std::ostream&, const Sales_data&);
    friend bool operator < (const Sales_data&, const Sales_data&);
    friend bool operator ==(const Sales_data&, const Sales_data&);
public:
    Sales_data() = default;
    Sales_data(const std::string &book) : bookNo(book) { }
    Sales_data(std::istream &is) { is >> *this; }
public:
    Sales_data& operator +=(const Sales_data&);
    std::string isbn() const { return bookNo; }
private:
    std::string bookNo;
    unsigned units_sold = 0;
    double sellingprice = 0.0;
    double saleprice = 0.0;
    double discount = 0.0;
};
    inline bool comparaIsbn(const Sales_data &lhs, const Sales_data &rhs)
    {return lhs.isbn() == rhs.isbn();}
    Sales_data operator+ (const Sales_data& lhs, const Sales_data& rhs);
    inline bool operator==(const Sales_data& lhs, const Sales_data& rhs)
    {
        return lhs.units_sold == rhs.units_sold &&
               lhs.sellingprice == rhs.sellingprice &&
               lhs.saleprice == rhs.saleprice &&
               lhs.isbn() == rhs.isbn();
    }
    inline bool operator!=(const Sales_data& lhs, const Sales_data& rhs)
    {
        return!(lhs == rhs);
    }

Sales_data& Sales_data::operator+=(const Sales_data& rhs)
{
    units_sold += rhs.units_sold;
    saleprice = (rhs.saleprice * rhs.units_sold + saleprice * units_sold)
                / (rhs.units_sold + units_sold);
    if (sellingprice != 0)
        discount = saleprice / sellingprice;
    return *this;
}
Sales_data operator+(const Sales_data& lhs, const Sales_data& rhs)
{
    Sales_data ret(lhs);
    ret += rhs;
    return ret;
}
std::istream& operator>>(std::istream& in, Sales_data& s)
{
    in >> s.bookNo >> s.units_sold >> s.sellingprice >> s.saleprice;
    if (in && s.sellingprice != 0)
        s.discount = s.saleprice / s.sellingprice;
    else
        s = Sales_data();
    return in;
}
std::ostream& operator<<(std::ostream&out, const Sales_data&s)
{
    out << s.isbn() << "" << s.units_sold << ""
        << s.sellingprice << "" << s.saleprice << "" << s.discount;
    return out;
}
int main()
{
    Sales_data book;
    std::cout << "请输入销售记录:" << std::endl;
    while (std::cin >> book) {
        std::cout << "ISBN、售出本数、原始价格、实售价格、折扣为" << book <<
                  std::endl;
    }
    Sales_data trans1, trans2;
    std::cout << "请输入两条ISBN相同的销售记录：" << std::endl;
    std::cin >> trans1 >> trans2;
    if (comparaIsbn(trans1, trans2))
        std::cout << "汇总信息：ISBN、售出本数、原始价格、实售价格、折扣为"
                  << trans1 + trans2 << std::endl;
    else
        std::cout << "两条销售记录的ISBN不同" << std::endl;
    Sales_data total, trans;
    std::cout << "请输入几条ISBN相同的销售记录：" << std::endl;
    if (std::cin >> total) {
        while (std::cin >> trans)
            if (comparaIsbn(total, trans))
                total += trans;
            else {
                std::cout << "当前书籍ISBN不同" << std::endl;
                break;
            }
        std::cout << "有效汇总信息：ISBN、售出本数、原始价格、实售价格、折扣为"
                  << total << std::endl;
    }
    else {
        std::cout << "没有数据" << std::endl;
        return -1;
    }
    int num = 1;
    std::cout << "请输入若干销售记录：" << std::endl;
    if (std:: cin >> trans1) {
        while (std::cin >> trans2)
            if (comparaIsbn(trans1, trans2))
                num++;
            else {
                std::cout << trans1.isbn() << "共有"
                          << num << "条销售记录" << std::endl;
                trans1 == trans2;
                num = 1;
            }
        std::cout << trans1.isbn() << "共有"
                  << num << "条销售记录" << std::endl;
    }
    else {
        std::cout << "没有数据" << std::endl;
        return -1;
    }
    return 0;
}

把格式简单整理了下，都是些很低级的错误，单词拼错什么的，楼主连这点耐心都没有，还是不要写代码了。

看书一定要下载源码，对照源码看吧。

读别人的代码一向是比较头疼的事情，兄台简单说下程序的功能，以及运行不了的状况是什么，才好判断，不然看着晕

你用断点调试器边调边看吧