HP HP-18C - Clearing the BUS Variables; Sharing Variables between Menus; Cost=4

Clearing the BUS Variables
Clearing variables sets them equal to O.
To clear the variables used by any of the BUS menus, display the
menu and press .1 CLEAR ALL I. For example, pressing .1 CLEAR ALL I
while in the %CHG menu clears OLD, NEW, and %CH. Clearing
COST
or PRICE in the MU%C or MU%P menu clears the value in both
menus.
All the variables used by the four BUS menus are cleared when you
press
.:aa to display the BUS menu.
Sharing Variables Between Menus
If you compare the MU%C menu and the MU%P menus, you'll see that
they have two menu labels in common- 1iJiI and 1iIaBI :
Figure 3-5. Shared Variables.
%CHG
%TOTL
MU%C MU%P
I
I
COST
PRICE M%C
COST PRICE M%P
Shared variables
The HP -18C keeps track of the values you key in according to those
labels. For example, if you key in a COST and PRICE in the MU%C
menu, exit to the BUS menu, and then display the MU%P menu, the
HP-18C retains those values. In other words, the variables are shared
between the two menus.
3: General Business Calculations 53