Re: Expression statements

[David Given <dg@...>]

On 16/08/10 20:24, Jonathan Castello wrote:
[...]
> Very true, I was referring to the literal value of the keywords
> though. I recall that VB's 'true' has a value of -1, which is a little
> disturbing...

That was common in a lot of Basics; it allowed them to get away without
boolean operators, since NOT 0 == -1 and NOT -1 == 0. This meant that
AND, OR and EOR didn't short circuit, since they were ordinary logical
operators.

...of course, it also meant this:

LET x = 1
IF x THEN PRINT "x is true!"
IF NOT x THEN PRINT "x is false!"

...would apparently violate causality.

Interesting tip about C: The !! 'operator' will collapse a value down to
0 or 1.

void* p = return_some_pointer();
printf("%d\n", !!p);

I haven't found a use for the ~~ 'operator' yet.

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