File Stream C++ Tutorial

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#include
#include
main()
{
  ofstream out("test.txt");
  if(! out)
  {  
    cout<<"Cannot open output file\n";
       return 1;
  }
  char nums[4]={'a','b','c','d'};
  out.write((char *)nums,sizeof(nums));
  out.close();
  ifstream in("test.txt");
  if(! in)
  {  
    cout<<"Cannot open input file\n";
       return 1;
  }
  in.read((char *)& nums,sizeof(nums));
  for(int i=0;i<4;i++)
    cout<  cout<<'\n';
  cout<  in.close();
  return 0;
}
a b c d
4characters read