how to count number of digits in O(1)?

I want to count number of digits in O(1)
And how is it possible?

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convert the integer to String (rather take the input as String) … length of the string is the number of digits in the NUMBER.

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This may help

More over you can do this while taking input simultaneously when using fast input methods like getchar() .

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Bro , you could easily get these things in one google search

Anyway the answer is log10(n)+1

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