QB64-website/wiki/OPTION--EXPLICIT.md

OPTION _EXPLICIT instructs the compiler to require variable declaration with DIM, REDIM or an equivalent statement.

Syntax

OPTION _EXPLICIT

Description

• With OPTION _EXPLICIT you can avoid typos by having QB64 immediately warn in the Status area of new variables used without previous declaration.
• Enable OPTION _EXPLICIT temporarily even if a program source file doesn't contain the directive by specifying the -e switch when compiling via command line (qb64 -c file.bas -e).

Error(s)

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

Example(s)

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

OPTION _EXPLICIT

DIM myVariable AS INTEGER

myVariable = 5

PRINT myVariabe

QB64 IDE Status will show: Variable 'myVariabe' (SINGLE) not defined on line 4

See Also

• OPTION _EXPLICITARRAY
• DIM, REDIM
• SHARED
• STATIC