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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.
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.
See the Mathematica book: Section 2.11.3, Section 3.1.4.
See also: NumberForm.
Further Examples
In standard output form, numbers are printed to 6 digits.
In[1]:= 
Out[1]= 
In input form, all known digits are printed.
In[2]:= 
Out[2]//InputForm= 
Here is an arbitrary-precision number in standard output form.
In[3]:= 
Out[3]= 
In input form, Mathematica explicitly indicates the precision of the number and gives extra digits to make sure the number can be reconstructed correctly.
In[4]:= 
Out[4]//InputForm= 
This makes Mathematica not explicitly indicate precision.
In[5]:= 
Out[5]//InputForm= 
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