ctype.h?

can anyone send me a link to the download for this library, Thanks!

I think you need to tell us a little bit about the context for this request.

With the Arduino environment installed on Windows, look for it here...

\arduino-0018\hardware\tools\avr\avr\include\ctype.h

If you're trying to reference it in a program, you will need to do an include in your sketch...

If it's missing, you need to reinstall your Arduino IDE

Thank you, i found it.