Thanks, Sevo! After checking Godfreys links I realize my description of the lenses wasn't very detailed and probably misleading. Sorry about that. Both lenses are actually AI. According to the Nikon website, the D7100 can do metering with AI lenses.
Originally Posted by sevo
They mount. But they will not meter (that is, your friend will be stuck with trial-and-error metering by live view and/or histogram).