Using conditional statements in ArcGIS Field Calculator?

I have two fields, "P_Area" and "PC_Area", whose sizes I'd like to compare in a third field, "Areas_Equal". The "Areas_Equal" field should contain a "Yes" if the other two are equal and a "No" if they aren't.

How can I do this with Field Calculator and its Python Parser?

Answer

If you're using Python in ArcGIS you may be using an = for comparison instead of an ==

Your code should be similar to the below, if you use Python:

Pre-Logic Script Code - Check "Show Codeblock"

def ifBlock(pArea,pcArea):
  if pArea == pcArea:

    return 1
  else:
    return 0

Then in the actual code:

ifBlock(!P_AreaFieldName!,!PC_AreaFieldName!)