HP (Hewlett-Packard) HP 33s ユーザーズマニュアル
Programming
Techniques
13–3
Nested Subroutines
A subroutine can call another subroutine, and that subroutine can call yet another
subroutine. This "nesting" of subroutines — the calling of a subroutine within
another subroutine — is limited to a stack of subroutines seven levels deep (not
counting the topmost program level). The operation of nested subroutines is as
shown below:
subroutine. This "nesting" of subroutines — the calling of a subroutine within
another subroutine — is limited to a stack of subroutines seven levels deep (not
counting the topmost program level). The operation of nested subroutines is as
shown below:
MAIN program
(top level)
End of program
Attempting to execute a subroutine nested more than seven levels deep causes an
% #$ error.
% #$ error.
Example:
A Nested Subroutine.
The following subroutine, labeled S, calculates the value of the expression
2
2
2
2
d
c
b
a
+
+
+
as part of a larger calculation in a larger program. The subroutine calls upon
another
another
subroutine (a nested subroutine), labeled Q, to do the repetitive squaring
and addition. This saves memory by keeping the program shorter than it would be
without the subroutine.
without the subroutine.