Comparing two floats

[Kunutsu]

i try to compare a (computed) value to a constant value like this:

let>x=5/8
if>%x%>0.5


actually the value of x is 0,625 and the condition should be true. but in the if-condition x seems to be interpreted as an integer value and "if>%x%>0,5" doesn't work.
can anyone tell me how to compare two floats correctly?

[JRL]

I would have thought that 0.625 would test greater than 0.5 but live and learn. Try multiplying the decimal values by 100 or 1000 or 10000 or whatever makes sense for your application then compare the integer values.

For example:

Let>num_1=0.625
Let>num_2=0.5
Let>num_1a=1000*%num_1%
Let>num_2a=1000*%num_2%
If>{%num_2a%<%num_1a%},LabelName

[JRL]

Actually I just tested and if the comparison is enclosed in braces 0.625 does test greater than 0.5. the following works for me.

Let>num_1=0.625
Let>num_2=0.5
If>{%num_2%<%num_1%},LabelName

[Marcus Tettmar]

It works for me:

Code: Select all

let>x=5/8
if>x>0.5
  MessageModal>%x% greater than 0.5
else
  MessageModal>%x% less than 0.5
endif

Now set x to a computation that results in less than 0.5 and it will jump correctly to the else statement

[Kunutsu]

hmm the result for your sourcecode is this:

http://img85.imageshack.us/my.php?image=cmpxo7.jpg

@JRL: of course you could do this, but its not a very good way to compare two floats. i would wonder if there is no better possibility

[Marcus Tettmar]

The issue is your system uses the comma (,) as the decimal separator, but you are comparing with a value using a period (.). You need to do this:

Code: Select all

let>x=5/8
if>x>0,5
   MessageModal>%x% greater than 0,5
else
  MessageModal>%x% less than 0,5
endif

[Kunutsu]

i already tried this, but it results in an error message:

http://img142.imageshack.us/my.php?imag ... msgna3.png

the message means something like "error - subroutine/label 5 not found!"

[Marcus Tettmar]

Sorry, my mistake, do this:

Code: Select all

let>x=5/8
Let>compare=0,5
if>x>compare
  MessageModal>%x% greater than 0,5
else
  MessageModal>%x% less than 0,5
endif

[Kunutsu]

yes this is working.