OPTION EXPLICITARRAY: Difference between revisions

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{{DISPLAYTITLE:OPTION _EXPLICITARRAY}}
{{DISPLAYTITLE:OPTION _EXPLICITARRAY}}
[[OPTION _EXPLICITARRAY]] instructs the compiler to require arrays to be properly dimensioned with [[DIM]] or [[REDIM]] before first use. However, it doesn't require regular variables to be declared.
[[OPTION _EXPLICITARRAY]] instructs the compiler to require arrays to be properly dimensioned with [[DIM]] or [[REDIM]] before first use. However, it doesn't require regular variables to be declared.



Revision as of 02:16, 23 January 2023

OPTION _EXPLICITARRAY instructs the compiler to require arrays to be properly dimensioned with DIM or REDIM before first use. However, it doesn't require regular variables to be declared.

Syntax

OPTION _EXPLICITARRAY


Description

  • Normally statements like x(2) = 3 will implicitly create an array x(). OPTION _EXPLICITARRAY requires proper dimensioning 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

Template:PageErrors


Examples

Example: 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



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