Order Of Execution - HP -67 Owner's Handbook Manual

66 The Automatic Memory Stack
Order of Execution
When you see a problem like this one:
5x[B+4-(5+2)+@x3)]+@3 x.213),
you must decide where to begin before you ever press a key.
Experienced HP calculator users have determined that by starting
every problem at its innermost number or parentheses and working
outward, just as you would with paper and pencil, you maximize
the efficiency and power of your HP calculator. Of course, with the
HP-67 you have tremendous versatility in the order of execution.
For example, you could work the problem above by beginning at
the left side of the equation and simply working through it in left-
to-right order. All problems cannot be solved using left-to-right order,
however, and the best order for solving any problem is to begin with
the innermost parentheses and work outward. So, to solve the problem
above:
Press Display
3
4
8 Intermediate answer for
(3 +4).
5 [5
2 [2.
& Intermediate answer for
S +2).
& Intermediate answer for
B+=4H-6~+2).
4
3
8 12.00 Intermediate answer for
(4 X 3).
Intermediate answer for
B+4)—(5+2)+
4 X 3).