seek_test.cpp

#include <iostream>
#include <fstream>

using namespace std;

int main(void) {
    fstream foo1;
    foo1.open("seek.bin", ios_base::in | ios_base::out | ios_base::binary | ios_base::trunc);
    int i;
    for(i = -100; i < 99; i ++) {
        foo1.write((char*) &i, sizeof(int));
    }
    foo1.flush();
    istream foo2(foo1.rdbuf());
    foo1.seekg(0, ios_base::beg);
    foo2.seekg(100 * sizeof(int), ios_base::beg);
    for(i = 0; i < 50; i++) {
        int j, k;
        foo1.read((char*) &j, sizeof(int));
        foo2.read((char*) &k, sizeof(int));
        cout << j << ", " << k << endl;
    }
}