Template:RelationalOperationsPlugin: Difference between revisions
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same general type, i.e. either numerical values or [[STRING]] values. | same general type, i.e. either numerical values or [[STRING]] values. | ||
If a test succeeds, then '''true''' (-1) is returned, '''false''' (0) if it fails, | If a test succeeds, then '''true''' (-1) is returned, '''false''' (0) if it fails, | ||
which can be used in further [[Boolean]] evaluations. | |||
┌─────────────────────────────────────────────────────────────────────────┐ | ┌─────────────────────────────────────────────────────────────────────────┐ | ||
│ '''[[Relational Operations]]''' │ | │ '''[[Relational Operations]]''' │ | ||
Revision as of 21:44, 27 November 2022
In this table, A and B are the values to compare. Both must be of the
same general type, i.e. either numerical values or STRING values.
If a test succeeds, then true (-1) is returned, false (0) if it fails,
which can be used in further Boolean evaluations.
┌─────────────────────────────────────────────────────────────────────────┐
│ Relational Operations │
├────────────┬───────────────────────────────────────────┬────────────────┤
│ Operation │ Description │ Example usage │
├────────────┼───────────────────────────────────────────┼────────────────┤
│ A = B │ Tests if A is equal to B. │ IF A = B THEN │
├────────────┼───────────────────────────────────────────┼────────────────┤
│ A <> B │ Tests if A is not equal to B. │ IF A <> B THEN │
├────────────┼───────────────────────────────────────────┼────────────────┤
│ A < B │ Tests if A is less than B. │ IF A < B THEN │
├────────────┼───────────────────────────────────────────┼────────────────┤
│ A > B │ Tests if A is greater than B. │ IF A > B THEN │
├────────────┼───────────────────────────────────────────┼────────────────┤
│ A <= B │ Tests if A is less than or equal to B. │ IF A <= B THEN │
├────────────┼───────────────────────────────────────────┼────────────────┤
│ A >= B │ Tests if A is greater than or equal to B. │ IF A >= B THEN │
└────────────┴───────────────────────────────────────────┴────────────────┘
The operation should be very obvious for numerical values. For strings,
the equal/not equal check is also pretty much straight forward, but for the
less/greater checks the ASCII value of the first different character is
used for the decision:
e.g. "abc" is less than "abd", because in the first difference (3rd char)
the "c" has a lower ASCII value than the "d".
This behavior may give you some subtle results, if you are not aware of
the ASCII values and the written case:
e.g. "abc" is greater than "abD", because small letters have higher ASCII
values than capital letters, hence "c" > "D". You may use either the
LCASE$ or UCASE$ function to make sure both strings use the same case.
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