fileptr.cpp

来自「C++ sample code, for the book: C++ blac」· C++ 代码 · 共 27 行

#include <iostream>
#include <fstream>
using namespace std;

class entry
{
public:
    char name[20];
    float owes;
    void display() {cout << name << " owes $" << owes << endl;}
};

int main()
{
    entry one_record;
    ifstream fin("file.dat", ios_base::binary);

    fin.seekg(9 * sizeof(entry), ios::beg);
    fin.read(reinterpret_cast<char *> (&one_record), sizeof(entry));

    one_record.display();

    fin.close();

    return 0;
}