Standard decimal numbers in the Wolfram Language are internally represented with machine precision*:
The InputForm of a given number displays all available digits:
Yet by default, only six digits of such machine-precision numbers are shown:
More digits can be displayed either for an individual number or all machine-precision numbers.
NumberForm displays the desired number of digits of a particular number:
NumberForm cannot return more digits than the number has:
- Navigate to the menu item Edit ▶ Preferences on Windows or Mathematica ▶ Preferences on Mac.
- Select the tab Appearance ▶ Numbers ▶ Formatting.
- In the line “Number of digits displayed in output”, set the preferred precision.
* It is of noninteger value since the precision of a number is defined in terms of the logarithm of the uncertainty in the corresponding exact value.
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