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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.
65 lines
2.4 KiB
Plaintext
65 lines
2.4 KiB
Plaintext
'''SELECT CASE''' is used to determine the program flow by comparing the value of a variable to specific values.
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{{PageSyntax}}
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:::::SELECT CASE variable
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::::::' [[CASE]]
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::::::' [[CASE IS]]
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::::::' [[CASE ELSE]]
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:::::[[END SELECT]]
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* Variable can be any literal string or numerical type. Can only evaluate ONE value or calculation.
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* Use SELECT CASE when IF statements get too long or complicated.
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* The CASE comparisons should cover the normal ranges of the variable values(use CASE ELSE if necessary).
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* CASEs should be listed in an ascending or descending values for best and fastest results.
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* The routine will execute code in the FIRST True [[CASE]] statement and exit the procedure.
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* Supports individual CASE values and ranges or lists of values as below:
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:* CASE value
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:* CASE value1 [[TO]] value2
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:* CASE value1, value2, value3
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:* [[CASE IS]] value1 > value2
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:* [[CASE ELSE]]
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* SELECT CASE statements must '''always''' be ended with [[END SELECT]]!
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* Use '''[[colon]]s''' to execute multiple statements in a one line statement. You cannot use AND for multiple statements!
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* An '''[[underscore]]''' can be used anywhere after the code on one line to continue it to the next line in '''QB64 ONLY'''.
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''Example:''
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{{CodeStart}}
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a = 100
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{{Cl|SELECT CASE}} a 'designate the value to compare
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{{Cl|CASE}} 1, 3, 5, 7, 9
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{{Cl|PRINT}} "This will not be shown."
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{{Cl|CASE}} 10
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{{Cl|PRINT}} "This will not be shown."
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{{Cl|CASE}} 50
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{{Cl|PRINT}} "This will not be shown."
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{{Cl|CASE}} 100
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{{Cl|PRINT}} "This will be displayed when a equals 100)"
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{{Cl|PRINT}} "(and no other case will be checked)"
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{{Cl|CASE}} 150
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{{Cl|PRINT}} "This will not be shown."
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{{Cl|CASE IS}} < 150
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{{Cl|PRINT}} "This will not be shown as a previous case was true"
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{{Cl|CASE}} 50 {{Cl|TO}} 150
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{{Cl|PRINT}} "This will not be shown as a previous case was true"
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{{Cl|CASE ELSE}}
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{{Cl|PRINT}} "This will only print if it gets this far!"
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{{Cl|END SELECT}} '' ''
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{{CodeEnd}}
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{{OutputStart}}
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This will be displayed when a equals 100)
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(and no other case will be checked)
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{{OutputEnd}}
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:''Explanation:'' The first case where a value is true is shown, the remainder are skipped. Try changing the value of 'a' to different numbers!
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''See also:''
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* [[CASE]], [[CASE IS]]
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* [[IF...THEN]], [[Boolean]]
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{{PageNavigation}} |