All Boolean operators return 1 (‘nonzero’) if the condition is met and 0 if it is not. The operator ‘not’ can be used to negate an expression, but remember to use parenthesis, as ‘not’ is stronger than all other operators: ‘not 1 > -1’ is nonzero, while ‘not (1 > -1)’ is zero. The other Boolean operators are all weaker than the arithmetic operators.
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Operator |
Description |
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Not |
Nonzero if the expression after ‘not’ is zero, otherwise zero. |
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<, <=, >, >=, =, <> |
Value comparison operators. |
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And |
Nonzero if the expressions on either side of ‘and’ are both nonzero. |
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Or |
Nonzero if one or both of the expressions on either side of ‘or’ is nonzero. |
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