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

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]

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