Sự giới thiệu Bản_mẫu:Val

Val stands for the number value that is its first parameter. Val specializes in scientific notations and uncertainty notations, and in a measurement value with physical units. It formats the number (with possible unit) according to the Manual of Style and keeps the expression from wrapping across lines.

Express a numeral:

  • {{val|123456.78901}} → value, formated with gaps: 12345678901, or with |fmt=commas → 12345678901.
  • {{val|number|number}} → value ± uncertainty, like 123478±56
  • {{val|number|(number)}} → value(uncertainty), like 12345(56).
  • {{val|number|number|number}} →value +uncertainty
    −uncertainty like 1234+56
    −78

Express a measurement value with a unit, for example {{val|4|ul=m/s2}} → 4 m/s2. The keyboard characters m/s2 are a "unit code" that |u=m/s2 marks up, or that |ul=m/s2 additionally links to its articulation.

Because the unit spacing and markup is a style issue, Val provides these for you. There are a large number of unit codes that Val understands and keeps "up to code". A unit code is usually composed of one or more abbreviated unit names and the usual math symbols on the typical keyboard. See {{Val/units}}.

Some unit-code flexibility is provided by having four parameters to work the unit-code system: whether to link one or not, (see Overlinking) , and whether to form a ratio or not with a unit code.

  • {{val|number|u=unit code}} → number markup , such as 98 m/s2
  • {{val|number|ul=unit code}} → number [[Article|markup]], such as 98 m/s2
  • {{val|number|u=unit code|upl=unit code}} → number markup/[[Article|markup]], such as 98 m/s2
  • {{val|number|ul=unit code|up=unit code}} → [[Article|markup]]/markup, such as 98 m/s2

To bypass the unit code system, if |u= does not recognize your unit code, it will accept any wikitext and render it as usual.

  • {{val|5.4|u=[[kg]]&sdot;[[meter|m]]/s<sup>2</sup>}} → 54 kg⋅m/s2
  • {{val|7.6|u=[[metre per second squared|m/s<sup>2</sup>]]}} → 76 m/s2

See below for § How to add units to the unit code system.

Sometimes a number and unit code is not enough. A prefix or suffix are also available, |p= and |s=.

  • {{val|7600|u=C&sdot;Ga|p=>|s=<}} → >7600 C⋅Ga<
  • {{val|7600|u=C|p=<span style="color:green"><sup>|s=</span></sup>}} → 7600 C

See {{val/testcases}} to learn the val parameters by a example. It's comprehensive, and there's over 100 examples.