[#BloombergLP-bdldfp-DecimalFormatConfig-2constructor-09]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdldfp.adoc[bdldfp]::xref:BloombergLP/bdldfp/DecimalFormatConfig.adoc[DecimalFormatConfig]::DecimalFormatConfig
:relfileprefix: ../../../
:mrdocs:

Create an object of this class having the specified `precision` to control how many digits are written after a decimal point.

== Synopsis

Declared in `<bdldfp_decimalformatconfig.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
DecimalFormatConfig(
    int precision,
    xref:BloombergLP/bdldfp/DecimalFormatConfig/Style-06.adoc[Style] style = e_NATURAL,
    xref:BloombergLP/bdldfp/DecimalFormatConfig/Sign-0a.adoc[Sign] sign = e_NEGATIVE_ONLY,
    char const* infinity = "inf",
    char const* nan = "nan",
    char const* snan = "snan",
    char point = '.',
    char exponent = 'e',
    bool showpoint = false,
    int expWidth = 2);
----

== Description

The behavior is undefined unless `precision >= ‐1`. Optionally specify `style` to control how the number is written. If it is not specified, `e_NATURAL` is used. Optionally specify `sign` to control how the sign is output. If is not specified, `e_NEGATIVE_ONLY` is used. Optionally specify `infinity` as a string to output infinity value. If it is not specified, "inf" is used. Optionally specify `nan` as a string to output NaN value. If it is not specified, "nan" is used. Optionally specify `snan` as a string to output signaling NaN value. If it is not specified, "snan" is used. The behavior is undefined unless the pointers to `infinity`, `nan` and `snan` remain valid for the lifetime of this object. Optionally specify `point` as the character to use for decimal points. If it is not specified, `.` is used. Optionally specify `exponent` as the character to use for exponent. If it is not specified, `e` is used. Optionally specify `showpoint` to force a decimal point to always be written. Optionally specify `expWidth` to force at least that many digits to be written for an exponent, up to the number of digits in the largest supported exponent. If it is not specified, 2 is used. The behavior is undefined unless `expWidth` is 1, 2, 3, or 4. See the  section for information on the class attributes.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *precision*
| number of digits written after the decimal point
| *style*
| how the decimal number is written
| *sign*
| how the sign is output
| *infinity*
| string used to output an infinity value
| *nan*
| string used to output a NaN value
| *snan*
| string used to output a signaling NaN value
| *point*
| character used for decimal points
| *exponent*
| character used for the exponent
| *showpoint*
| whether a decimal point is always displayed
| *expWidth*
| minimum number of digits used to write the exponent
|===


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