How can i convert a string which is col2 in the update statement to a number size 10,2

i am trying to do cint but it is not accepting.

Could you please tell me.

**************************Start************************
for n = 1 to thisform.pageframe1.page3.list1.listcount

col1 = thisform.pageframe1.page3.list1.listitem(n, 1)
col2 = thisform.pageframe1.page3.list1.listitem(n, 2)

update actions set sub_id = col2 where sub_key = col1

endfor

*************************END******************************

Thank you.