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42 lines
1.6 KiB
Plaintext
42 lines
1.6 KiB
Plaintext
The '''MID$''' function returns a portion of a [[STRING]]'s value from any position inside a string.
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{{PageSyntax}}
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:: MID$(''stringvalue$'', ''startposition%''[, ''bytes%''])
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''[[Parameters]]:''
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* ''stringvalue'' can be any literal or variable [[STRING]] value having a length. See [[LEN]].
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* ''startposition'' designates the non-zero position of the first character to be returned by the function.
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* ''bytes'' (optional) tells the function how many characters to return including the first character when it is used.
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''Usage:''
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* When the ''bytes'' value is not used the function returns the remainder of the string from the starting character position.
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* Number of character ''bytes'' should be within the string's [[LEN|length]] from the start position, but will only return the string's remainder when exceeded.
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* If the ''bytes'' value is 0 or the ''start position'' is 0 or greater than the [[LEN|length]] of the string, nothing is returned (no error).
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* In QBasic the ''start position'' cannot be zero(0) or an [[ERROR Codes|Illegal function call error]] will occur.
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''Example:'' Getting the hour and minutes from [[TIME$]]
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{{CodeStart}} '' ''
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{{Cl|PRINT}} {{Cl|TIME$}}
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hour$ = {{Cl|LEFT$}}({{Cl|TIME$}}, 2)
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minutes$ = {{Cl|MID$}}({{Cl|TIME$}}, 4, 2) ' skip hours and the colon (3 characters)
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{{Cl|PRINT}} "hour = "; hour$; ": minutes = "; minutes$ '' ''
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{{CodeEnd}}
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{{OutputStart}}
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11:23:30
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hour = 11: minutes = 23
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{{OutputEnd}}
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''See also:''
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* [[MID$ (statement)]], [[LEFT$]], [[RIGHT$]]
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* [[LTRIM$]], [[RTRIM$]], [[INSTR]], [[LEN]]
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{{PageNavigation}} |