Check status: EOF encountered, Non-Fatal I/O error, Fatal I/O error

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

void checkstatus(ifstream &in);

int main(int argc, char *argv[])
{
  if(argc!=2) {
    cout << "Usage: Display <filename>\n";
    return 1;
  }

  ifstream in(argv[1]);

  if(!in) {
    cout << "Cannot open input file.\n";
    return 1;
  }

  char c;
  while(in.get(c)) {
    if(in) cout << c;
    checkstatus(in);
  }

  checkstatus(in);  // check final status
  in.close();
  return 0;
}

void checkstatus(ifstream &in)
{
  ios::iostate i;

  i = in.rdstate();

  if(i & ios::eofbit)
  
    cout << "EOF encountered\n";
  
  else if(i & ios::failbit)
  
    cout << "Non-Fatal I/O error\n";
  
  else if(i & ios::badbit)
  
    cout << "Fatal I/O error\n";
}

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Check status: EOF encountered, Non-Fatal I/O error, Fatal I/O error : ifstream « File « C++

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