HP 35s Scientific Calculator - Manual (Page 191)

Simple Programming 13-9
A different checksum means the program was not entered exactly as given here.
Example: Entering a Program with an Equation.
The following program calculates the area of a circle using an equation, rather than
using RPN operations like the previous program.

Cancels program entry
(PRGM annunciator off).
Keys:
(In RPN mode)
Display: Description:


 
Activates Program–entry
mode; sets pointer to top of
memory.
E   
Labels this program routine
E (for "equation").
R
  
Stores radius in variable R
 
 R
 
 π
Selects Equation–entry
mode; enters the equation;
returns to Program–entry
mode.
 


 
Ends the program.
 (2)  

Displays label E and the
length of the program in
bytes.
 
 Checksum and length of
program.

Cancels program entry.