1-28 RPL Programming
To change the current flag states:
1. Enter the flag-state argument- see below
2. Execute STOF (!°L %MODES% %FLAG% L%STOF% ).
STOF sets the current states of flags based on the flag-state argument:
gn
s
Changes the states of only the system flags.
f gn
s-lower
gn
u-lower
gn
s-upper
gn
u-upper
!hChanges the states of the system and user flags.
Example: The program PRESERVE on page 2-6 uses RCLF and STOF.
Using Subroutines
Because a program is itself an object, it can be used in another program as a subroutine. When program B is
used by program A, program A calls program B, and program B is a subroutine in program A.
Example: The program TORSA calculates the surface area of a torus of inner radius a and outer radius b.
TORSA is used as a subroutine in a second program TORSV, which calculates the volume of a torus.
The surface area and volume are calculated by
A π
2
b
2
a
2
–()= V
1
4
---
π
2
b
2
a
2
–()ba–()=
(The quantity in the second equation is the surface area of a torus calculated by TORSA.)
Here are the stack diagram and program listing for TORSA.
Level 2 Level 1 " Level 1
a b
"
surface area
Program: Comments:
"!
#!$!%!
+iWH.-%WH0$WH/+!
#=5M
Creates local variables a and b.
Calculates the surface area.
Converts algebraic to a number.
»
`
O TORSA K
Puts the program on the stack.
Stores the program in TORSA.
π
2
b
2
a
2
–()
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