Is there a reason why you can't just use char array instead of string type? Strictly speaking, there is no string type in ANSI C anyway. The only worry I would have using char array is the lack of pointer support (as I was told) that makes passing a char array around impossible but then you have the snprintf intrinsic that takes "char *" in RobotCIntrinsics.c. So it must have some pointer support. That's what confuses me and I never have time to test this out. So may be you should try out the snprintf with char array and let us know if it works. Some RobotC intrinsics support char * and some don't and I never figure out why.