Thirty years ago I was a system architect and co-developer of a commercial spreadsheet program for IBM minicomputers (alas, 6 months before Lotus 1-2-3 came out!), and wrote an expression evaluator in FORTRAN IV using in-fix notation. I first wrote one in RPN notation. The difference in effort was minimal. The in-fix version was also just as easy to understand in code. The programming model was a finite-state machine, and it wasn't that hard to do after you tokenized the input line. At 10:15 AM 4/23/2009, Isaac Marino Bavaresco wrote: >I agree, RPN would be the most compact and efficient solution. > >But I think if the users need to learn RPN for using his product then it >may reduce the number of potential clients. > ================================================================ Robert A. LaBudde, PhD, PAS, Dpl. ACAFS e-mail: ral@lcfltd.com Least Cost Formulations, Ltd. URL: http://lcfltd.com/ 824 Timberlake Drive Tel: 757-467-0954 Virginia Beach, VA 23464-3239 Fax: 757-467-2947 "Vere scire est per causas scire" ================================================================ -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist