HP 33s Scientific manual Clearing Variables, Arithmetic with Stored Variables, Storage Arithmetic

Clearing Variables

Variables' values are retained by Continuous Memory until you replace them or clear them. Clearing a variable stores a zero there; a value of zero takes no memory.

To clear a single variable:

Store zero in it: Press 0 Ivariable.

To clear selected variables:

1.Press {Y{#} and use šor ™to display the variable.

2.Press {c.

3.Press ‡to cancel the catalog.

To clear all variables at once:

Press {c{# }.

Arithmetic with Stored Variables

Storage arithmetic and recall arithmetic allow you to do calculations with a number stored in a variable without recalling the variable into the stack. A calculation uses one number from the X–register and one number from the specified variable.

Storage Arithmetic

Storage arithmetic uses I›, I…, Iz, or I qto do arithmetic in the variable itself and to store the result there. It uses the value in the X–register and does not affect the stack.

New value of variable = Previous value of variable {+, –, ⋅, ⎟} x.

For example, suppose you want to reduce the value in A(15) by the number in the X–register (3, displayed). Press I…A. Now A = 12, while 3 is still in the display.

3–4Storing Data into Variables