HP 35s Quick Start Guide

Getting Started 5
Undo key
The operation of the Undo key depends on the calculator con-
text, but it serves mainly to recover from the deletion of an entry,
rather than to undo any arbitrary operation. Press z:
immediately after using a or  to recover:
• an entry you deleted, as a digit in an expression.
• an equation deleted while in equation mode.
• a program line deleted while in program mode.
Table 1 Backspace and Clear Operations
Key Description
a
Backspace and Clear. If an expression is in the
process of being entered, pressing
a erases the
character to the left of the entry cursor ( _ ).
Otherwise, with a completed expression or the result
of a calculation in line 2,
~ replaces that result with
a zero.
~ also clears error messages and exits
menus.

Clear or Cancel. This key (also the ON key) clears the
displayed number to zero or cancels the current
context (menu, message, prompt, or Equation– or
Program–entry).
{b
Clear. The Clear menu has options for clearing the
number in the X-register, all direct variables, all
memory, etc.

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