[tutorial] loops and faking goto line

[Tony]

@Raknarg -- that only works with a very limited number of (condition)s (as you'd have to write out all of the elseif paths yourself), and if all of the condition values are known ahead of time.

E.g.: (condition)'s value is obtained during the execution of stuff() in a non-deterministic way (such as user input).

[Raknarg]

Yeah, that's why I like fake goto lines better

[mirhagk]

Raknarg @ Sun May 22, 2011 2:18 pm wrote:

Well, there's different ways to do it. The way my teacher is telling me to do it is just by using an if statement.

Instead of:

Turing:

loop      stuff      exit when (condition)      more stuff      exit end loop

You could use:

Turing:

if (condition) then      stuff else      stuff      more stuff end if

Get it?

Um How about the ultra simple:

Turing:

stuff if (not condition) then      more stuff end if

I would say that's much cleaner than both options, with less lines of code.

[2goto1]

mirhagk @ Tue May 24, 2011 4:41 pm wrote:

Um How about the ultra simple:

Turing:

stuff if (not condition) then      more stuff end if

I would say that's much cleaner than both options, with less lines of code.

I agree. For increased readability, as a general best practice in all languages, I like to try to name boolean variables with names that imply a positive value. It makes boolean comparisons more readable because you avoid double negatives. For example, the code below tests if someone is of legal driving age:

Turing:

var isNotLegalDrivingAge : boolean := false if (not isNotLegalDrivingAge) then      % The person if of legal driving age end if

It can get messy when you start to code logic containing lots of these double negative conditions. Instead, name your boolean variables with names that imply a positive condition, such as the following:

Turing:

var isLegalDrivingAge : boolean := false if (isLegalDrivingAge) then      % The person if of legal driving age end if

[Hoshi]

I like your Review on loops . It is very helpful for test review! It goes well with Cervantes Loops Tutorial too