HP 35s User Manual

6-14 Entering and Evaluating Equations
 To change the number, type the new number and press . This new
number writes over the old value in the X–register. You can enter a number as
a fraction if you want. If you need to calculate a number, use normal
keyboard calculations, then press
. For example, you can press 2
 5  in RPN mode, or press 2 5 in ALG
mode. Before pressing
, the expression will display in line 2, and
after pressing
, the result of the expression will display in line 2.
 To cancel the prompt, press
. The current value for the variable remains in
the X–register and displays in right-side of the line two. If you press

during digit entry, it clears the number to zero. Press
 again to cancel the
prompt.
 To display digits hidden by the prompt, press
 .
In RPN mode,each prompt puts the variable value in the X–register and disables
stack lift. If you type a number at the prompt, it replaces the value in the X–register.
When you press
, stack lift is enabled, so the value is saved on the stack.
The Syntax of Equations
Equations follow certain conventions that determine how they're evaluated:
 How operators interact.
 What functions are valid in equations.
 How equations are checked for syntax errors.
Operator Precedence
Operators in an equation are processed in a certain order that makes the
evaluation logical and predictable:

HP 35s Specifications

General

Type	Scientific
Form factor	Pocket
Product color	Black
Digits	14 digits
Display number of lines	2 lines
Keyboard type	Alphanumeric
Menus and prompts	Yes

Weight and Dimensions

Dimensions (WxDxH)	157.9 x 18 x 82 mm