how do I convert int to double in PigLatin?

[hc busy]

if my table is:

t = load 'data' as (v:int, c:int);

and I want to do

u = foreach t generate c/v as cov;

how do I get fraction out of this? because

u = foreach t generate (double)c / v;

crashes with a casting error for me, do I write an UDF?