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Appendix A: Functions and Instructions 833
isLocked() CATALOG
isLocked(var_name) ⇒
⇒⇒
⇒
true,false
Determines if var_name is locked or not.
Returns
true if var_name is locked or archived.
Returns
false if var_name is not locked or
archived.
isLocked(PROG1) ¸ False
isPrime() MATH/Test menu
isPrime(
number
) ⇒
⇒⇒
⇒
Boolean constant expression
Returns true or false to indicate if
number
is a
whole number ‚ 2 that is evenly divisible only by
itself and 1.
If
number
exceeds about 306 digits and has no
factors 1021,
isPrime(
number
) displays an
error message.
If you merely want to determine if
number
is
prime, use
isPrime() instead of factor(). It is
much faster, particularly if
number
is not prime
and has a second-largest factor that exceeds
about five digits.
IsPrime(5) ¸ true
IsPrime(6) ¸ false
Function to find the next prime after a specified
number:
Define nextPrim(n)=Func:Loop:
n+1!n:if isPrime(n):return n:
EndLoop:EndFunc ¸ Done
nextPrim(7) ¸ 11
isVar() CATALOG
isVar(var_name) ⇒
⇒⇒
⇒
true,false
Determines if var_name is in use. Returns true
if
var_name exists. Returns false if var_name
does not exist.
isArchiv(PROG1) ¸ True
Item CATALOG
Item
itemNameString
Item
itemNameString
,
label
Valid only within a Custom...EndCustm or
ToolBar...EndTBar block. Sets up a drop-down
menu element to let you paste text to the cursor
position (
Custom) or branch to a label
(
ToolBar).
Note: Branching to a label is not allowed within
a
Custom block.
See Custom example.
Lbl CATALOG
Lbl
labelName
Defines a label with the name
labelName
in the
program.
You can use a
Goto
labelName
instruction to
transfer program control to the instruction
immediately following the label.
labelName
must meet the same naming
requirements as a variable name.
Program segment:
©
:Lbl lbl1
:InputStr "Enter password", str1
:If str1ƒpassword
: Goto lbl1
:Disp "Welcome to ..."
©