HP 48g Graphing Calculator - Manual (Page 417)

it’s automatically evaluated to a number—you don’t need
EVAL. >NUM or
IF begins the test-clause, which leaves a test result on the stack.
THEN removes the test result from the stack. If the value is nonzero,
the true-clause is executed—otherwise, the false-clause is executed.
After the appropriate clause is executed, execution resumes following
END.
CASE...END
To enter CASE...END in a program:
1. Press (PRG) B R C h C A S E to enter
CASE... riir.\...i;\D...r,.\D.
2. For each additional test-clause, move the cursor after a test-clause
END and press ¡7^ CfiSE to enter THEN...END.
The syntax for the CASE...END structure is:
CASE
test-clausei H true-clausei END
test-clause^ THEN true-clause
2
END
test-clause^ THEN true-clause^ END
default-clause (optional)
This structure lets you execute a series of test-clause commands, then
execute the appropriate true-clause sequence of commands. The first
test that returns a true result causes execution of the corresponding
true-clause, ending the CASE...END structure. Optionally, you
can include after the last test a default-clause that’s executed if
all the tests evaluate to false. If a test-clause is an algebraic, it’s
automatically evaluated to a number—you don’t need ^NUM or
EVAL.
When CASE is executed, test-clausei is evaluated. If the test is true,
true-clausei is executed, and execution skips to END. If test-clausei is
false, execution proceeds to test-clause 2 . Execution within the CASE
structure continues until a true-clause is executed, or until all the
test-clauses evaluate to false. If a default clause is included and all the
test-clauses evaluate to false, the default clause executes.
29
Programming the HP 48 29-11