HP 35s Scientific Calculator - Manual (Page 192)

13-10 Simple Programming
Running a Program
To run or execute a program, program entry cannot be active (no program–line
numbers displayed; PRGM off). Pressing
 will cancel Program–entry mode.
Executing a Program (XEQ)
Press  label to execute the program labeled with that letter:
To execute a program from it’s beginning press  label  . For example,
press A  . The display will show ” ” and execution will
start at the top of Label A.
You can also execute a program starting at another position by pressing 
label Line number, for example    .
If there is only one program in memory, you can also execute it after moving pointer
to the top of the program line and pressing
 (run / stop) key. The PRGM
annunciator displays and the  annunciator turns on while the program is running.
If necessary, enter the data before executing the program.
Example:
Run the programs labeled A and E to find the areas of three different circles with
radii of 5, 2.5, and 2
π. Remember to enter the radius before executing A or E.
Keys:
(In RPN mode)
Display: Description:
A 

Enters the radius, then starts
program A. The resulting area is
displayed.
E
 
Calculates area of the second
circle using program E.
  
A 
Calculates area of the third circle.