IF/THEN formula in excel to compare columns

I am attempting to have two columns equal each other in excel. The first column (AC) has the value "." and the second column (BA) has the value "0". I want something that says if BA=0 then AC is a match to it. I am doing some comparisons and because of this difference the comparisons are not recognizing that these two are actually a match. There are around 18,000 rows on this so I'm hoping to do an IF/THEN formula rather than change all of the 0s.

Can someone please help me?