readobj.cpp

来自「C++ sample code, for the book: C++ blac」· C++ 代码 · 共 34 行

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

const int NUMBER_OBJECTS = 15;

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

int main()
{
    entry object_array[NUMBER_OBJECTS];
    ifstream fin("file.dat", ios_base::binary);

    if (!fin.is_open()) {
        cerr << "Error: Could not open file." << endl;
        exit(1);
    }

    fin.read(reinterpret_cast<char *> (object_array), 
        NUMBER_OBJECTS * sizeof(entry));

    object_array[0].display();
    object_array[1].display();

    fin.close();

    return 0;
}