HP 33s - Manual (Page 188)

13–4 Programming Techniques
In RPN mode,
  Starts subroutine here.
  "!  Enters A.
  "!  Enters B.
  "!  Enters C.
  "!  Enters D.
  Recalls the data.
 
 
 

º
 A
2
.
 %
€ M A
2
+ B
2
.
N €
 %
€ O A 2 + B 2 + C 2
P €
 %
€ Q A
2
+ B
2
+ C
2
+ D
2
R €
 º 2 2 2 2 D C B A + + +
 ! Returns to main routine.
 
 MOQ Nested subroutine
 º65¸
 º

 - Adds x
2
.
NPR 
 ! Returns to subroutine S.
Branching (GTO)
As we have seen with subroutines, it is often desirable to transfer execution to a
part of the program other than the next line. This is called branching.
Unconditional branching uses the GTO (go to) instruction to branch to a program
label
. It is not possible to branch to a specific line number during a program.