is it true ?

[Alex Tweedly]

Jeanne A. E. DeVoto wrote:

>
>   Note: Transcript uses what is known as "short-circuit evaluation" 
> for logical operators. This means that value1 is evaluated first. If 
> value1 is false, the expression value1 and value2 is false regardless 
> of what value2 is (because the expression evaluates to false unless 
> both the values are true). In this case, Revolution does not evaluate 
> value2, since doing so is not necessary to determine the value of 
> value1 and value2. For example, evaluating the expression asin(2) 
> normally causes an execution error (because 2 is not a legal argument 
> for the arc sine function), but evaluating the expression (1 = 0) and 
> (asin(2) = 1) does not cause an error:  since (1 = 1) is always false, 
> the whole statement is always false and Revolution never tries to 
> evaluate the asin function.
>
> (This is under "and" and "or", and probably at least the first part 
> should be included in "if" as well.)
>
Probably should be under 'if' and maybe under 'switch/case' as well; 
hopefully while changing that, someone will fix the typo that inverts 
the meaning .....

> expression (1 = 0) and (asin(2) = 1) does not cause an error:  since 
> (1 = 1) is always false, the whole statement is always false and 
> Revolution never tries to evaluate the asin function.
>
should be "since (1 = 0) is always false"


-- 
Alex Tweedly       http://www.tweedly.net



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