How do I read till the end of a file?

[CodeMonkey2000]

Suppose I am reading from a data file but I have no idea about its size. I tried doing something like this:

c++:

#include <iostream> #include <fstream> using namespace std; int main() {         ifstream fin("foo.txt");         int a;         while(fin>>a)         {                 //whatever         } }

But it doesn't work

[HeavenAgain]

code:

while (!fin.eof( ))

instead of

code:

while(fin>>a)

does that work? because you are checking if it is the end of the file, not if it have something.... thats a bit weird

[CodeMonkey2000]

No, it still goes past the eof. Why doesn't this work?

[OneOffDriveByPoster]

CodeMonkey2000 @ Sun Jan 20, 2008 9:22 pm wrote:

No, it still goes past the eof. Why doesn't this work?

Assuming that all the file reading code is there (none in the "whatever") and that your input is of the right form, I am not quite sure why it doesn't work (may be missing something obvious though). If you did not type the input file yourself, make sure you try with something that you saved on the same machine with a reasonable text editor. If you are using DOS/Windows editors, your file may have a DOS end-of-file character that is confusing your program.

[CodeMonkey2000]

Never mind, I was actually dividing by zero. Strange though, my compiler kept saying that I have reached the end of file...

[md]

Compilers tell you they've reached the end of the file when there is a syntax error of some kind.

Programs generate EOF errors (or more usually segfaults) when they reach the end of files.

Terminology is key