use read() and write().cpp

来自「This program uses read() and write()」· C++ 代码 · 共 38 行

// Use read() and write().
#include <iostream>
#include <fstream>
using namespace std;

int main()
{
  int n[5] = {1, 2, 3, 4, 5};
  register int i;

  ofstream out("test", ios::out | ios::binary);
  if(!out) {
    cout << "Cannot open file.\n";
    return 1;
   }

  out.write((char *) &n, sizeof n);

  out.close();

  for(i=0; i<5; i++) // clear array
    n[i] = 0;

  ifstream in("test", ios::in | ios::binary);
  if(!in) {
    cout << "Cannot open file.\n";
    return 1;
  }

  in.read((char *) &n, sizeof n);

  for(i=0; i<5; i++) // show values read from file
    cout << n[i] << " ";

  in.close();

  return 0;
}