LiveCode Forums.

Posted: **Mon Aug 13, 2012 4:28 am**

Hey guys, I am determining whether a variable has either 2, 3 or 4.

In this example , localValueN has "2"

   local localValueN 
   put "2" into localValueN

      if localValueN = "2"
   then 
      put "is 2" into anotherVar
   else
      if localValueN = "3"
      then
         put "is 3" into anotherVar
      else
         put "is 4"into anotherVar
      end if
   end if

   answer anotherVar

Question 1:
Can anyone think of a leaner, smarter, or shorter way to write this logic?

Question 2:
Can we put more code into each line? maybe some break that LiveCode understands when code starts or ends??
like this

Code: Select all

   local localValueN ; put "2" into localValueN ; if localValueN = "2" ; then; put "is 2" into anotherVar ; else ; if localValueN = "3" ; then ; put "is 3" into anotherVar ; else ; put "is 4"into anotherVar ; end if ;end if
   answer anotherVar

Posted: **Mon Aug 13, 2012 6:53 am**

You can use the semi-colon as a line break in Rev, so your second example will work, but I think it is still too wordy, so try this:

Code: Select all

local localValueN
local anotherVar

put ("is" && localValueN) into anotherVar
answer anotherVar

Posted: **Mon Aug 13, 2012 7:25 am**

Or you could use a Switch statement to cover multiple choices:

Code: Select all

switch localValueN
case "2"
  // do something when it is 2
  break
case "3"
  // likewise for value = 3
  break
case "10000000000"
   // 'cos it's a nice big number (which I really wish I had in my bank account!)
  break
default
  // Handle all other options that are not covered above
end switch

I personally use switch's for any multi value variable (with a simple number of results) instead of a bunch of if's - mainly because they are more readable to me.

As with most languages though - there are a few ways of achieving the results you want - dependent on the effect you are after.

Cheers,
Dave

Posted: **Mon Aug 13, 2012 9:52 am**

Hi,

this is everything but OFF-TOPIC!?
Will move the thread...

Posted: **Mon Aug 13, 2012 1:52 pm**

You can also do it this way.
put any item of "2,3,4" into localValueN

Code: Select all

 if localValueN = "2" then put 2 into anotherVar -- No need for end if as long as its all on 1 line
 if localValueN = "3" then put 3 into anotherVar
 if localValueN = "2" then put 3 into anotherVar

I kinda prefer switch too though.

For something like this you could also do a simple substitution list

Code: Select all

put "1,2,3,4,5,6,7,8" into tNums -- define matching lists
put "a,b,c,d,e,f,g,h" into tLetters

put any item of tNums into n
get itemoffset(n,tNums) -- find what item number n is
put item it of tLetters into anotherVar -- anotherVar now contains the matching item from tLetters

Of course if you're going to do that, and have an exact match value to value you can put everything into an array and lookup based on the array key.

Posted: **Mon Aug 13, 2012 7:45 pm**

I am very new and I just know I am showing my ignorance, but could you not just say something like this?

Code: Select all

if ((localValueN >1) and (localValueN < 5)) then 
put "is " &  localValueN into  anotherVar
end if

That is assuming of course, you are only interested in values of 2, 3, or 4. Might be some kind of "in" construct in the language.
Like:

Code: Select all

if localValueN is in range 2 to 4 then put "is " & localValueN into anotherVar

I have not tested that to be sure it is legal LC syntax.
Yours,
-Paul

iwannaprogram wrote:Hey guys, I am determining whether a variable has either 2, 3 or 4.

In this example , localValueN has "2"
Code: Select all
   local localValueN 
   put "2" into localValueN

      if localValueN = "2"
   then 
      put "is 2" into anotherVar
   else
      if localValueN = "3"
      then
         put "is 3" into anotherVar
      else
         put "is 4"into anotherVar
      end if
   end if

   answer anotherVar
Question 1:
Can anyone think of a leaner, smarter, or shorter way to write this logic?

Question 2:
Can we put more code into each line? maybe some break that LiveCode understands when code starts or ends??
like this
Code: Select all
   local localValueN ; put "2" into localValueN ; if localValueN = "2" ; then; put "is 2" into anotherVar ; else ; if localValueN = "3" ; then ; put "is 3" into anotherVar ; else ; put "is 4"into anotherVar ; end if ;end if
   answer anotherVar

Posted: **Mon Aug 13, 2012 8:05 pm**

Your first example is fine. For the second, try

Code: Select all

if localValueN is in "234" then put "is " & localValueN into anotherVar

I normally prefer the switch construct as well, but there are many ways of getting a solution to any given problem.

LiveCode Forums.

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Simple logic, but, is another way Possible?

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Re: Simple logic, but, is another way Possible?

Re: Simple logic, but, is another way Possible?

Re: Simple logic, but, is another way Possible?

Re: Simple logic, but, is another way Possible?

Re: Simple logic, but, is another way Possible?