Undo Key - HP 35s Quick Start Manual

Table 1 Backspace and Clear Operations
Key
Backspace and Clear. If an expression is in the
process of being entered, pressing
character to the left of the entry cursor ( _ ).
Otherwise, with a completed expression or the result
of a calculation in line 2,
a zero.
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).
Clear. The Clear menu has options for clearing the
number in the X-register, all direct variables, all
memory, etc.

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
immediately after using
• 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.
Description
also clears error messages and exits
~
or
erases the
replaces that result with
~
to recover:
Getting Started 5
: