HP 30b - Business Professional Calculator - Debugging a Program

Programming
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3. Press > until the letter R appears, and then press I. Press . and the
screen should display a ?.
4. Press Oto exit.
5. Press
: (HOLD) . Then press Oto exit.
6. Now enter program mode again by pressing :E. The display will show R? in
video inverse. Since program 0 has a message as the first command, it is now named
R?. The video inverse signifies that it is assigned to a key, in this case k. Press
Oto exit.
7. N ow p re s s :k. Notice R? appears, and the program pauses to wait for input.
Type 5= and press : (HOLD) to resume. The program continues and
calculates the volume.
Debugging a Program
At times, programs do not work as expected. You can debug your programs by pressing the
: (HOLD) > or : (HOLD) < keys as follows:
Open the Program menu and select the program you want to debug. To execute the first
instruction, press : (HOLD) <. Press this key combination repeatedly to execute your
program one instruction at a time. The current instruction is displayed as long as the <
key is pressed.
If you want to see the next instruction without executing it, press
: (HOLD) > in the
same manner.
If you want to let the program continue by itself, press : (HOLD) . If you want to
start debugging a program in the middle, place a run/stop (R/S) instruction where you want
to start debugging the program, run the program and start debugging using
: (HOLD)
> or < when the program stops due to the R/S.