NumberForm¶

Prints a number to a given precision. NumberForm[x, n] shows n significant figures, NumberForm[x, {n, f}] shows n digits with f of them after the decimal point.

$ wo 'ToString[NumberForm[1234.5678, 6]]'
1234.57

$ wo 'ToString[NumberForm[50., {3, 1}]]'
50.0

NumberPoint replaces the decimal point:

$ wo 'ToString[NumberForm[1234.5, NumberPoint -> ","]]'
1234,5

DigitBlock groups the digits — from the right on the integer side and from the left on the fractional side — with NumberSeparator between the blocks:

$ wo 'ToString[NumberForm[1234.5678, {8, 4}, DigitBlock -> 2]]'
12,34.56 78

$ wo 'ToString[NumberForm[1234.5678, {8, 4}, DigitBlock -> 3, NumberSeparator -> {"|", "_"}]]'
1|234.567_8

NumberPadding -> {left, right} fills the field: the left string pads the integer columns, the right one the fractional slots past the value's significant digits.

$ wo 'ToString[NumberForm[12.3, {8, 3}, NumberPadding -> {"*", "0"}]]'
****12.300

By default the sign stays next to the digits; SignPadding -> True moves it in front of the padding:

$ wo 'ToString[NumberForm[-12.3, {6, 2}, NumberPadding -> {"0", "0"}]]'
00-12.30

$ wo 'ToString[NumberForm[-12.3, {6, 2}, SignPadding -> True, NumberPadding -> {"0", "0"}]]'
-0012.30

An argument that is not an approximate number renders as itself:

$ wo 'ToString[NumberForm[Pi, 5]]'
Pi