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based on an earlier version of the Wolfram Language.
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$NumberMarks

$NumberMarks
gives the default value for the option NumberMarks, which specifies whether ` marks should be included in the input form representations of approximate numbers.
  • $NumberMarks=True indicates that ` should by default be used in all approximate numbers, both machine-precision and arbitrary-precision ones.
  • $NumberMarks=Automatic indicates that ` should by default be used in arbitrary-precision but not machine-precision numbers.
  • $NumberMarks=False indicates that ` should by default never be used in outputting numbers.
The default value of $NumberMarks is Automatic:
MachinePrecision numbers are shown without a number mark:
Arbitrary-precision numbers are shown with a mark and the precision:
Temporarily force machine numbers to be shown with number marks:
The default value of $NumberMarks is Automatic:
In[1]:=
Click for copyable input
Out[1]=
MachinePrecision numbers are shown without a number mark:
In[2]:=
Click for copyable input
Out[2]//InputForm=
Arbitrary-precision numbers are shown with a mark and the precision:
In[3]:=
Click for copyable input
Out[3]//InputForm=
 
Temporarily force machine numbers to be shown with number marks:
In[1]:=
Click for copyable input
Out[1]=
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