[camposrf]

I am trying to make a conditional expression with "if" command in CFX-10.0

I read these articles:
Conditional Expression in CFX Pre

"if" command in CFX-13 is not really an "if" command!!!!

But I do not know how to do it in CFX pre 10.0

I saw in youtube that "if" expression works on CFX 14, but I do not have it (my PC is old)
https://www.youtube.com/watch?v=GJXQNhmqyhE
(11:25)

The string that I want to use is for define the volume fraction in a water tank:
WaterVolFrac =if(y<WaterHt,1,0)*if(y>-0.1[ft],1,0)

This is the error message:
__________________________________________

ERROR
Error in setting: "WaterVolFrac" via the expression:
if(y<WaterHt,1,0)*if(y>-0.1[ft],1,0)
Error found at the start of the line, at item: if
unrecognised name
__________________________________________


I read the _CFXTutorial.book.pdf, Tutorial_FreeSurfaceBump.pdf but they don't use the if command, they use this string:
DownVFAir = step((y-DownH)/1[m])