1. An electronic data processing apparatus comprising: an input means for entering data processing functions including numeric data and a plurality of operational commands corresponding to data processing operations; an arithmetic means connected to said input means for performing entered data processing functions according to the respective hierarchial ranks of entered operational commands and generating a numeric result, said arithmetic means including an implied multiplication means for performing an implied multiplication of a first hierarchial rank when successive inputs include one of a prefix set followed by one of a first suffix set and for performing an implied multiplication of a second hierarchial rank lower than said first hierarchical rank when successive inputs include one of said prefix set followed by one of a second suffix set; and output means for generating an operator perceivable indication of said numeric result generated by said arithmetic means.