Boolean values: Difference between revisions
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Zero is false, any other number is true. Attempting to use a string or sequence as a boolean is assumed to be a programming logic blunder and causes a fatal run-time error.
Conditions such as <code>if length(s) then</code> are permitted, but the more explicit <code>if length(s)!=0 then</code> is generally preferred
Comparison operators evaluate to 1(true) or 0(false).
A boolean test is inverted by preceding it with the keyword <code>not</code>. The null character ('\0') is considered false, all other characters are deemed true.
The builtin constants TRUE/FALSE and their aliases True/true/False/false may also be used.
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