Thread: Strange bug with Input stream

Hi,

Ive been stuck on this bug for a while now, Ive tried googling the answers etc but everything I try seems to fail:

Code:

string yytext;
char ch;

            instream.get(ch);
            yytext += ch;                      // Puts character from stream on the end of the string

            while(isalnum(ch))              // loop while character is alpha-numeric
            {
                instream.get(ch);            // needs to call the next character in the stream
                yytext += ch;                  // add character to end of string
            }

instream is streaming a text file into the program; this part of my function needs to stick alphanumeric characters together in to a word.

Whats happening is the instream.get(ch); is just pulling the same character off the instream, and going into an infinite loop

is there a nice simple call I can use to increment the steam position?
Any suggestions would be awesome,

thanks,

Pete