The fl BASIC program forms a single list from two lists using intersection, union, or exclusion operators.
Syntax
fl file.reference1 list1 {operators} {file.reference2} {list2}
fl ?
Parameter(s)
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list1 |
First list. |
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list2 |
Second list. |
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operators |
= |
Indicates an intersection. Forms list of matching items. |
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+ |
Indicates a union. Forms list of nonduplicate items. |
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- |
Indicates an exclusion. Forms list of items not in list 2. |
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? |
Displays help text on the screen. |
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If file reference 2 is not specified, it is assumed to be the same as file reference 1. If list 2 is not specified, it is assumed to be the same as list 1. If neither file reference 2 nor list 2 are specified, the effect is the same as a get-list. The created list overlays list 1 in file reference 1.
Example(s)
fl pointer-file football.fans + baseball.fans
Creates a list of all sports fans from both lists.
fl pointer-file football.fans = baseball.fans
Creates a list of those who enjoy both sports.
fl pointer-file football.fans - baseball.fans
Creates a list of those who like football only.
See Also