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NumberMarks—Wolfram Documentation

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NumberMarks

is an option for InputForm and related functions that specifies whether ` marks should be included in the printed forms of approximate numbers.

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NumberMarks

NumberMarks

is an option for InputForm and related functions that specifies whether ` marks should be included in the printed forms of approximate numbers.

Details

  • The default setting for NumberMarks is given by the value of $NumberMarks.
  • NumberMarks->True indicates that ` should be used in all approximate numbers, both machine‐precision and arbitrary‐precision ones.
  • NumberMarks->Automatic indicates that ` should be used in arbitrary‐precision but not machine‐precision numbers.
  • NumberMarks->False indicates that ` should never be used in outputting numbers.
  • Number marks are used to indicate the type of numbers, and their precision or accuracy.
  • The *^ form for scientific notation is always used in InputForm, and is independent of NumberMarks.

Examples

Basic Examples  (2)

Machine numbers format without number marks by default:

Wolfram Language code: InputForm[N[1 / 3]]

The same number with number marks:

Wolfram Language code: InputForm[N[1 / 3], NumberMarks -> True]

Extended-precision numbers include number marks by default:

Wolfram Language code: InputForm[N[10 / 3, 20]]

Without number marks:

Wolfram Language code: InputForm[N[10 / 3, 20], NumberMarks -> False]
Wolfram Research (1996), NumberMarks, Wolfram Language function, https://reference.wolfram.com/language/ref/NumberMarks.html.

Text

Wolfram Research (1996), NumberMarks, Wolfram Language function, https://reference.wolfram.com/language/ref/NumberMarks.html.

CMS

Wolfram Language. 1996. "NumberMarks." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/NumberMarks.html.

APA

Wolfram Language. (1996). NumberMarks. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/NumberMarks.html

BibTeX

@misc{reference.wolfram_2026_numbermarks, author="Wolfram Research", title="{NumberMarks}", year="1996", howpublished="\url{https://reference.wolfram.com/language/ref/NumberMarks.html}", note=[Accessed: 14-November-2026]}

BibLaTeX

@online{reference.wolfram_2026_numbermarks, organization={Wolfram Research}, title={NumberMarks}, year={1996}, url={https://reference.wolfram.com/language/ref/NumberMarks.html}, note=[Accessed: 14-November-2026]}