HP 39gII, User Manual

Page: 266 / 355

256 Programming
When assigning a value to a cell in a list, vector, or
matrix, use the command rather than
:=
. For example,
the command
73
L1 ( 5 ) will put the number 73 into the
5th position of list L1. If you are entering a program using
a calculator emulator running on a computer, then => can
be used as a synonym for .
Branch
Commands
IF…THEN…END Syntax:
IF
test
THEN
command(s)
END
;
Evaluate test . If test is true (non 0), execute command(s) .
Otherwise, nothing happens.
Example:
IF…THEN…ELSE…END
Syntax:
IF
test
THEN
command(s) 1
ELSE
command(s)2
END
;
Evaluate test . If test is true (non 0), execute command(s)1 ,
otherwise, execute command(s)2
IFTE Syntax:
IFTE
( test,true_xpr,false_xpr )
Evaluates test . If test is true (non 0), return true_xpr ,
otherwise return false_xpr
IFERR…THEN…END
IFERR
commands1
THEN
commands2 [
ELSE
commands3 ]
END
;
Executes sequence of commands1 . If an error occurs
during execution of commands1 , execute sequence of
commands2 . Otherwise, execute sequence of
commands3 .
CASE…END Syntax:
CASE
IF
test1
THEN
commands1
END
IF
t est2
THEN
commands2
END
…
[
DEFAULT
commands ]
END
;
Evaluates test1 . If true, execute commands1 and end the
CASE
. Otherwise, evaluate test2 . If true, execute