Шаблон:Round/doc

This templates rounds parameter 1 to the number of digits after the point optionally given as parameter 2. If parameter 2 is negative, rounding is to a multiple of 10. If parameter 2 is undefined, numbers with 4 digits before the point are rounded to integers, numbers with 3 digits before the point are rounded to 1 digit after the point, numbers with 2 digits before the point are rounded to 2 digits after the point, and numbers with 1 digit before the point or none are rounded to 3 digits after the point.

In other words, if parameter 2 is undefined, rounding is to 4 significant digits, except that it is not cruder than rounding to an integer and not finer than rounding to three digits after the decimal point.

Examples:

"{{round|123.456|4}}" gives "123.456" [1]
"{{round|123.456|3}}" gives "123.456" [2]
"{{round|123.456|2}}" gives "123.46" [3]
"{{round|123.456|1}}" gives "123.5" [4]
"{{round|123.456|0}}" gives "123" [5]
"{{round|123.456|-1}}" gives "120" [6]
"{{round|123.456|-2}}" gives "100" [7]
"{{round|123.456|-3}}" gives "0" [8]

"{{round|123456.789}}" → "123457" [9]
"{{round|12345.6789}}" → "12346" [10]
"{{round|1234.56789}}" → "1235" [11]
"{{round|123.456789}}" → "123.5" [12]
"{{round|12.3456789}}" → "12.35" [13]
"{{round|1.23456789}}" → "1.235" [14]
"{{round|.123456789}}" → "0.123" [15]
"{{round|.0123456789}}" → "0.012" [16]
"{{round|.00123456789}}" → "0.001" [17]

Note that trailing zeros are not shown, so rounding can seem cruder than has actually been applied:

"{{round|123.04}}" → "123" [18]
"{{round|12.304}}" → "12.3" [19]
"{{round|1.2304}}" → "1.23" [20]

While this is a limitation of the template (normally there would be trailing zeros to show the precision), there is also the general problem that if a number is an integer with trailing zeros, then the precision is not clear:

"{{round|1230.4}}" → "1230" [21]

See also