Count streak of alternate 1 and 0

[15minoffame]

Hi,
I have ones & zeros in column C. Is there a formula that will show me a streak of alternate ones & zeros like at the bottom where there's six in a row?

Thank you!

	C
1	0
2	0
3	0
4	1
5	0
6	0
7	1
8	0
9	0
10	0
11	1
12	0
13	0
14	0
15	0
16	1
17	0
18	1
19	0
20	1
21	0

<colgroup><col width="64" style="width:48pt"> </colgroup><tbody>
</tbody>

 

[Peter_SSs]

I'm looking for a formula to count a streak of alternate one and zero in Column D. This would tell me how many days in a row a stock has alternated between an up and a down day.

Unfortunately, that did not actually answer my question.

So, for the sample data in post 4, what result(s) do you want and can you explain in words why?