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I was trying with DecimalForm, but I read that the suitable one is NumberForm[0.5^20, 12] from version 11.

But when I evaluate

NumberForm[0.5^20, 12]

Mathematica 11 shows the result in scientific notation. How can I obtain the output in pure decimal notation?

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    $\begingroup$ You can use an option like NumberForm[0.5^20, {12, 11}, ScientificNotationThreshold -> {-100, 100}]. $\endgroup$ Dec 2, 2017 at 10:37
  • $\begingroup$ @b.gatessucks Math 11 says NumberForm::optx: Unknown option ScientificNotationThreshold in NumberForm[9.53674 10^(-7),{12,11},ScientificNotationThreshold->{-100,100}]. Mathematica it´s so complicate for simple things!! and so beautifull in other ones. $\endgroup$
    – Mika Ike
    Dec 2, 2017 at 10:38

2 Answers 2

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You can use AccountingForm consult help for it. I tried and look the result

AccountingForm[0.2^20, 40]

0.0000000000000104857600000000
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    $\begingroup$ @MikaIke You might not be happy with AccountingForm when using negative numbers! $\endgroup$
    – Carl Woll
    Dec 2, 2017 at 17:11
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Before M11.2 you can use ExponentFunction:

NumberForm[0.5^20, 12, ExponentFunction->(Null&)]

0.000000953674316406

In M11.2 you can also use the option ScientificNotationThreshold as suggested by @b.gatessucks:

NumberForm[0.5^20, 12, ScientificNotationThreshold->{-Infinity, Infinity}]

0.000000953674316406

Instead of NumberForm, you could use DecimalForm:

DecimalForm[.5^20]

0.000000953674316406

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