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I want to add three columns and I want to to put that result in another column. How can I do this?

For example:

C   C1   C2   C3 
10   3    3    1

Here I want to add C1, C2 and C3 and store the result in column C.

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You can't. Every cell has a 2-dimensional reference. The answer to your sum will need to go into a cell on it's own, e.g. C4 –  Lee Taylor Nov 28 '12 at 11:54
Are you expecting 3+3+1 to equal 10? –  pnuts Dec 3 '12 at 20:13

2 Answers 2

I am answering this for the fun of it.

C   C1   C2   C3 
10   3    3    1

Click cell C4, then in the FormulaBar > type =SUM() > Highlight cells C 1-3 and press Enter

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keep data in A1,B1 & C1 & put =SUM(A1+B1+C1) in D1.

If you want to add up strings from three different columns, use merge.

For strings, you can use =Concatenate(A1,B1,C1)

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Excel "under the hood" only stores s couple of datatypes: doubles & strings. In this case it would use doubles, not strings. –  Jeremy Thompson Nov 28 '12 at 11:07

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