Within the real numbers, logarithms of zero and negative numbers are not defined. If you are interested in calculating logarithms within the complex number system, the Wikipedia article on "logarithm" has the necessary formulae. In this case, you can obtain the logarithm of a negative number, but not of zero.
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Using a calculator, log of 123 = 4.81218
This means 10^(4.81218) = 123 (approximately)