This is documentation for Mathematica 3, which was
based on an earlier version of the Wolfram Language.
 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=