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based on an earlier version of the Wolfram Language.
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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.
  • 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.
Machine numbers format without number marks by default:
The same number with number marks:
Extended-precision numbers include number marks by default:
Without number marks:
Machine numbers format without number marks by default:
In[1]:=
Click for copyable input
Out[1]//InputForm=
The same number with number marks:
In[2]:=
Click for copyable input
Out[2]//InputForm=
 
Extended-precision numbers include number marks by default:
In[1]:=
Click for copyable input
Out[1]//InputForm=
Without number marks:
In[2]:=
Click for copyable input
Out[2]//InputForm=
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