how to check end of file ?

Code:

---

ifstream fin( "file.dat") ;

while(fin) // end of file checking
{
// do something
}

---

question 1 :
fin is a object. it is not a boolean variable . so how can i use this to check end of file ?




question2:
what are other ways i can check end of file ?

thanks

>fin is a object. it is not a boolean variable
It does, however, have an implicit conversion operator that allows it to be used in a boolean context.

>so how can i use this to check end of file ?
You don't, that's not a sound way to do it.

>what are other ways i can check end of file ?
One way (assuming string input):

Code:

---

while ( getline ( fin, str ) ) {
  ...
}

---

Another way:

Code:

---

for ( ; ; ) {
  // Get input
  if ( fin.eof() )
    break;
  ...
}

---

Naturally the first is preferable if you can manage it. I can't be more specific since you didn't say what you are using for input.