Another example of read() and write() and illustrates the use of gcount( ) #include #include using namespace std; int main() { double doubleNumberArray[4] = {99.75, -34.4, 1776.0, 200.1}; int i; ofstream out("numbers", ios::out | ios::binary); if(!out) { cout << "Cannot open file."; return 1; } out.write((char *) &doubleNumberArray, sizeof doubleNumberArray); out.close(); for(i=0; i<4; i++) // clear array doubleNumberArray[i] = 0.0; ifstream in("numbers", ios::in | ios::binary); in.read((char *) &doubleNumberArray, sizeof doubleNumberArray); cout << in.gcount() << " bytes read\n"; // see how many bytes have been read for(i=0; i<4; i++) // show values read from file cout << doubleNumberArray[i] << " "; in.close(); return 0; }