0 different from empty space

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Hi
I have this formula
If at41 is 0 write 2, if not -- > empty space
But it write 2 even if I don't write nothing!!!
If I write 0 o if I don't write nothing, it always write 2 !!!!
I want that it write 2 only when I write 0
Thanks!

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this works!!
but If I want to add to this:
if at43=1, then write 1 ???

I explain all:
now is :
if at41="", then ""; if at41=0, then write 2; if at41 is empty

and I want to add:
if at43 (so a different cell!!) is 1, then write 1 ???