Is there a length function for C/C++?
For example:
php: strlen($mystring);
javascript: mystring.length();
EDIT: That is usable with the arduino.exe program.
Yes, it's called "strlen"
Look at :-
http://www.nongnu.org/avr-libc/user-manual/modules.html
Don`t forget to use #include <????.h>
Look at string.h and stdlib.h