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NumberForm
NumberForm[
expr
,
n
] prints with approximate real numbers in expr given to n-digit precision.
NumberForm[
expr
,
n
,
f
] prints with approximate real numbers having n digits, with f digits to the right of the decimal point.
NumberForm works on integers as well as approximate real numbers.
The following options can be given:
All options except ExponentFunction apply to integers as well as approximate real numbers.
You can mix NumberForm and BaseForm.
NumberForm acts as a "wrapper", which affects printing, but not evaluation.
See the Mathematica book: Section 2.8.7.
See also: ScientificForm, EngineeringForm, AccountingForm, BaseForm, PaddedForm, N.
Further Examples
This breaks digits into blocks of length 3.
In[1]:= 
Out[1]//NumberForm= 
You can specify any string to use as a separator between blocks of digits.
In[2]:= 
Out[2]//NumberForm= 
This gives an explicit plus sign for positive numbers, and uses | in place of a decimal point.
In[3]:= 
Out[3]//NumberForm= 
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