Number of Digits?

Algebra Level 3

Which of these is the correct function for returning the number of digits in a positive integer, n n ?

⌊ log ⁡ 10 n ⌋ + 1 \lfloor \log_{10} n \rfloor +1 ⌊ n 10 ⌋ \left \lfloor \frac n{10} \right \rfloor ⌊ log ⁡ 10 n ⌋ \lfloor \log_{10} n \rfloor ⌈ log ⁡ 10 n ⌉ − 1 \lceil \log_{10} n \rceil - 1 ⌈ log ⁡ 10 n ⌉ \lceil \log_{10} n \rceil

William Whitehouse by William Whitehouse , 22, United Kingdom

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1 solution

You can go through then one by one and most don't work at all. ceiling(log10(n)) works for all n=/=10^m. (i.e. let n=10, log10(n)=1=ceiling(1)=/=2. )

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