InFix & PostFix notation

[Jim Horn]

A similar flowchart was in my college computer programming textbook, albeit with a bug. When I bought my HP-67 in 1976, it was fun putting that algorithm into its 224 steps, making the HP-67 capable of handling infix calculations directly, with roughly 12 levels of parenthesis and pending operations (including CHS and exponentiation). Gene Wright put that program in his Games collection that was mentioned in this forum a year or so ago. Not a very practical program but an enjoyable exercise in parsing and stack manipulation in such a limited programming system!