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Why can't I add two long fields into a float?

Question asked by lynnsonger on Nov 15, 2018
Latest reply on Nov 16, 2018 by RGuttmacher-esristaff

I have  two long integer fields in a shapefile  A and B.  I created a new long integer field C and a float field D.  When I add A and B using the field calculator into Field C and Field D my results are not always the same. 

I performed the addition of A and B into a field set to Double field and the results were correct.  Just wondering why?

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