HP 33S, User Manual

Page: 164 / 388

12–6
Simple Programming
File name 33s-English-Manual-040130-Publication(Edition 2).doc Page : 388
Printed Date : 2004/1/30 Size : 13.7 x 21.2 cm
5. End the program with a return instruction, which sets the program pointer back
to
 
after the program runs. Press
º Ô
.
6. Press
Å
(or
¹ £
) to cancel program entry.
Numbers in program lines are stored as precisely as you entered them, and they're
displayed using ALL or SCI format. (If a long number is shortened in the display,
press
º Î
to view all digits.)
To enter an equation in a program line:
1. Press
º d
to activate Equation–entry mode. The EQN annunciator
turns on.
2. Enter the equation as you would in the equation list. See chapter 6 for details.
Use
~
to correct errors as you type.
3. Press
Ï
to terminate the equation and display its left end. (The equation
does not become part of the equation list.)
After you've entered an equation, you can press
º Î
to see its checksum
and length. Hold the
Î
key to keep the values in the display.
For a long equation, the and annunciators show that scrolling is active for
this program line. You can use
Õ
and
Ö
to scroll the display.
Keys That Clear
Note these special conditions during program entry:
Å
always cancels program entry. It never clears a number to zero.
If the program line doesn't contain an equation,
~
deletes the current
program line. It backspaces if a digit is being entered ("_" cursor present).
If the program line contains an equation,
~
begins editing the equation. It
deletes the rightmost function or variable if an equation is being entered ("  "
cursor present).
¹ ¡
{

} deletes a program line if it contains an equation.
To program a function to clear the X–register, use
¹ ¡
{

}.