OPTION EXPLICITARRAY - QB64Official/qb64 GitHub Wiki

OPTION _EXPLICITARRAY instructs the compiler to require arrays be declared with DIM, REDIM or equivalent.

Syntax

OPTION _EXPLICITARRAY

Description

Normally statements like x(2) = 3 will implicitly create an array x(). OPTION _EXPLICITARRAY requires a preceding declaration for the array, helping to catch mistyped array and function names.
Unlike OPTION _EXPLICIT, simple variables can still be used without a declaration. Example: i = 1

Error(s)

It's not advisable to use OPTION _EXPLICITARRAY in $INCLUDEd modules.

Example(s)

Avoiding simple typos with OPTION _EXPLICITARRAY results shown in the QB64 IDE Status area.


OPTION _EXPLICITARRAY
x = 1 'This is fine, it's not an array so not affected

DIM z(5)
z(2) = 3 'All good here, we've explicitly DIMmed our array

y(2) = 3 'This now generates an error

QB64 IDE Status will show:

Array 'y' (SINGLE) not defined on line 7

See Also