问题
Suppose there is an empty excel sheet. Enter formula "=A1" into the B1 cell. The value of B1 would be 0.
My question is: why the value of B1 becomes zero when referring to an empty cell A1? Any rationales Excel behaves this way?
Thanks.
回答1:
That is because the formula in B1 returns the value of cell A1.
Excel assigns the value 0 to a blank cell.
To distinguish 0 from blank, in B1 enter:
=IF(A1="","",A1)
回答2:
FWIW, force a zero-length string with =A1&"". This can also be used to show (an apparently blank) cell when a VLOOKUP of INDEX/MATCH wants to return a zero after encountering a blank cell to return. Two caveats: first, a zero-length string is not truly blank and second, if used with VLOOKUP(...)&"" then any true number that should have been returned as a true number becomes text-that-looks-like-a-number. – Jeeped
Quoting the best answer so I can vote on it :)
I changed my application to =formula&"" according to Jeeped, and works great. Kinda dumb that Index returns Value(formula).
来源：https://stackoverflow.com/questions/43191270/excel-why-the-value-of-a-blank-cell-is-zero