c++ 中文件的操作

[chen08206416]

struct books
{
string BookName;
stirng BookId;
double price;
};
怎么用文件读和写？

[taodm]

google并下载《汤姆斯旺编程秘诀》

[zhsp1029]

没明白是什么意思，文件存的是一个结构？

[JJZHK]

汤姆斯旺编程秘诀
这么酷的名字。
旺仔小馒头。哈哈。

[boys2002]

[Quote=引用楼主 chen08206416 的帖子:]
struct books
{
string BookName;
stirng BookId;
double price;
};
怎么用文件读和写？
[/Quote]


楼主要读什么呢？
没有文件呢？

[boys2002]

[Quote=引用楼主 chen08206416 的帖子:]
struct books
{
string BookName;
stirng BookId;
double price;
};
怎么用文件读和写？
[/Quote]

楼主要读什么呢？没有文件啊？


文件在哪里呢？呵呵

[WangLy_2008]

头文件books.h

#include <string>
#include <iostream>
#include <fstream>
#include <map>

using namespace std;

struct books
{
public:
books(const string &bookname, const string &bookid):
BookName(bookname),BookId(bookid), price(0.0){}
public:
void read_file(books &) const;
friend istream& operator>>(istream&, books&);
friend ostream& operator<<(ostream&, const books&);
public:
books(): price(0.0) {};

private:
string BookName;
string BookId;
double price;
};


inline
void
books::read_file(books & rhs) const
{
cout << rhs.BookName << " "
<< rhs.BookId << " "
<< rhs.price;
}

inline
istream&
operator>>(istream& in, books& s)
{
in >> s.BookName >> s.BookId >> s.price;
return in;
}

inline
ostream&
operator<<(ostream& out, const books& s)
{
out << s.BookName << "\t" << s.BookId<< "\t"
<< s.price << "\t" ;
return out;
}



#include "books.h"

int main()
{
string infile("books_file");
ifstream ifile(infile.c_str());

if(!ifile)
{
throw runtime_error("Unable to open the input file");
}
books book;
while( ifile >> book)
{
book.read_file(book);
cout << endl;
}

system("pause");
}

[WangLy_2008]

文件格式是
BookNmae BookId price
例如：
c++ 123-34-45 12.01
c# 345-56-7 34.03

[moolleychean]

boost::serialization