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32 lines
1.4 KiB
Plaintext
32 lines
1.4 KiB
Plaintext
'''This page is maintained for historic purposes. The usage of the DECLARE keyword explained below isn't required/implemented in QB64. QB64 ignores any occurrences of DECLARE SUB/FUNCTION when older code is compiled. For the modern usage of the DECLARE keyword (for external C procedures), see [[DECLARE LIBRARY]].'''
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----
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The '''DECLARE''' statement is used to tell Qbasic that a [[SUB]] or [[FUNCTION]] is to be used in the program with specific parameter types.
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{{PageSyntax}}
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:: '''DECLARE''' {SUB|FUNCTION} ProcedureName ([''parameter'' [[AS]] type[, ...]])
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* '''QB64 ignores DECLARE SUB or FUNCTION statements, so define the parameter [[TYPE]]s in the SUB procedure!'''
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* Parameters MUST be placed in parenthesis separated by commas when necessary.
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* Empty parenthesis are required when no parameters are used.
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* Declarations should be placed at the top of the main program code after {{KW|Metacommand}} and {{KW|DEFINT|DEF}} statements if used.
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* Parameters can be defined in a DECLARE statement [[AS]] [[INTEGER]], [[SINGLE]], [[DOUBLE]], [[LONG]], [[STRING]] or [[ANY]].
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* The Qbasic IDE can automatically DECLARE a SUB or FUNCTION once the procedure is called and the module is Saved.
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* If a procedure is never called, it will not be automatically be DECLAREd by the Qbasic IDE when the program is saved.
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''See also:''
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* [[SUB]], [[FUNCTION]]
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* [[CALL]], [[BYVAL]]
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* [[DECLARE LIBRARY]] (QB64 ONLY)
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{{PageNavigation}}
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