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52 lines
1.5 KiB
Plaintext
52 lines
1.5 KiB
Plaintext
The [[OPTION BASE]] statement is used to set the default lower bound of arrays.
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{{PageSyntax}}
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: [[OPTION BASE]] {0|1}
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{{PageDescription}}
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* This statement affects array declarations where the lower bound of a dimension is not specified.
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* When used, [[OPTION BASE]] must come before any array declarations ([[DIM]]) to be affected.
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* By default, the lower bound for arrays is zero, and may be changed to one using the statement.
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* Otherwise, arrays will be dimensioned from element 0 if you DIM just the upper bounds.
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* You can also set other array boundaries by using [[TO]] in the DIM declaration such as {{InlineCode}}DIM array(5 TO 10){{InlineCodeEnd}}
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{{PageExamples}}
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''Example 1:'' Set the default lower bound for array declarations to one.
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{{CodeStart}}
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{{Cl|OPTION BASE}} 1
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' Declare a 5-element one-dimensional array with element indexes of one through five.
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{{Cl|DIM}} array(5) {{Cl|AS}} {{Cl|INTEGER}}
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{{Cl|PRINT}} {{Cl|LBOUND}}(array)
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{{CodeEnd}}
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{{OutputStart}} 1{{OutputEnd}}
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''Example 2:'' Set the default lower bound for array declarations to zero.
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{{CodeStart}} '' ''
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{{Cl|OPTION BASE}} 0
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' Declare an 18-element two-dimensional array with element indexes of zero through two
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' for the first dimension, and 10 through 15 for the second dimension.
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{{Cl|DIM}} array(2, 10 to 15) {{Cl|AS}} {{Cl|INTEGER}}
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{{Cl|PRINT}} {{Cl|LBOUND}}(array, 1)
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{{Cl|PRINT}} {{Cl|LBOUND}}(array, 2)
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{{CodeEnd}}
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{{OutputStart}} 0
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10
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{{OutputEnd}}
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{{PageSeeAlso}}
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* [[Arrays]], [[LBOUND]], [[UBOUND]]
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* [[DIM]], [[REDIM]], [[STATIC]], [[COMMON]]
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{{PageNavigation}}
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