Wrong, floatv() is for the latest C-Script Version AND for Lite-C to convert var to float (typecasting to float somehow doesn´t work in this case). If you use C-Script and floatv() doesn´t work, use the old float() instead.

Lite-C Tut. 1 Lite-C Tut. 2 Lite-C Tut. 3 (en)
Shader Tutorial (ger)

http://www.slindev.com