A character string has the value false if it is
0, and true
if it is 1. The logical operators take one or
two such values and return
0 or
1 as appropriate. Values other than
0 or
1 are not permitted.
&
AND — returns 1 if both
terms are true.
|
Inclusive OR — returns 1
if either term or both terms are true.
&&
Exclusive OR — returns 1
if either term, but not both terms, is true.
Prefix \, ¬
Logical NOT— negates; 1
becomes 0, and
0 becomes 1.
