mirror of
https://github.com/QB64-Phoenix-Edition/QB64pe.git
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6e01fc8dce
Added new _STRCMP and _STRICMP commands for quick string comparisons. Cleaned up QB64 to finish removing the QUI (quick user insert) code and folders. Altered UCASE and LCASE routines to be faster in some situations for us.
50 lines
1.6 KiB
Plaintext
50 lines
1.6 KiB
Plaintext
The {{KW|OPTION BASE}} statement is used to set the default lower bound of arrays.
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{{PageSyntax}}
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:{{KW|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, {{KW|OPTION BASE}} must be used before any array declarations ({{KW|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 {{KW|TO}} in the DIM such as: DIM array(5 TO 10)
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* Note: Neither '''OPTION''' nor '''BASE''' can be used as numerical variable names.
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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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* {{KW|Arrays}}, {{KW|LBOUND}}, {{KW|UBOUND}}
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* {{KW|DIM}}, {{KW|REDIM}}, {{KW|STATIC}}, {{KW|COMMON}}
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{{PageNavigation}} |