!f.eof error

[Andy Eder]

Hey folks,

I have to read a .dat file with f.eof till the end of it but my Dev C++ writes an error,

"f undeclared (first use this function)"

and I dunno what to do.

[edit]I have already written "use namespace std;" at the beginning of my .cpp file[edit]

while (!f.eof())
        {
        f.getline(cstring, sizeof(cstring));
        textprintf_ex(screen,font,100,m,makecol(255,255, 255), -1,"%s", cstring);
        m=m+20;
        }