icu::number::Notation Class Reference

A class that defines the notation style to be used when formatting numbers in NumberFormatter. More...

`#include <numberformatter.h>`

Inheritance diagram for icu::number::Notation:

## Static Public Member Functions

static ScientificNotation | scientific ()
| Print the number using scientific notation (also known as scientific form, standard index form, or standard form in the UK). More...
static ScientificNotation | engineering ()
| Print the number using engineering notation, a variant of scientific notation in which the exponent must be divisible by 3. More...
static CompactNotation | compactShort ()
| Print the number using short-form compact notation. More...
static CompactNotation | compactLong ()
| Print the number using long-form compact notation. More...
static SimpleNotation | simple ()
| Print the number using simple notation without any scaling by powers of ten. More...

## Friends

struct | impl::MacroProps
class | ScientificNotation
class | impl::NumberFormatterImpl
class | impl::ScientificModifier
class | impl::ScientificHandler
class | impl::GeneratorHelpers

## Detailed Description

A class that defines the notation style to be used when formatting numbers in NumberFormatter.

Stable:
  ICU 60

Definition at line 205 of file numberformatter.h.

## Member Function Documentation

## compactLong()

static CompactNotation icu::number::Notation::compactLong | ( |  | ) |

static

Print the number using long-form compact notation.

For more information on compact notation, see compactShort.

In long form, the powers of ten are spelled out fully. Example outputs in en-US when printing 8.765E7 through 8.765E0:

    88 million
    8.8 million
    876 thousand
    88 thousand
    8.8 thousand
    876
    88
    8.8

Returns
  A CompactNotation for passing to the NumberFormatter notation() setter.

Stable:
  ICU 60

## compactShort()

static CompactNotation icu::number::Notation::compactShort | ( |  | ) |

static

Print the number using short-form compact notation.

Compact notation, defined in Unicode Technical Standard #35 Part 3 Section 2.4.1, prints numbers with localized prefixes or suffixes corresponding to different powers of ten. Compact notation is similar to engineering notation in how it scales numbers.

Compact notation is ideal for displaying large numbers (over ~1000) to humans while at the same time minimizing screen real estate.

In short form, the powers of ten are abbreviated. In en-US, the abbreviations are "K" for thousands, "M" for millions, "B" for billions, and "T" for trillions. Example outputs in en-US when printing 8.765E7 through 8.765E0:

    88M
    8.8M
    876K
    88K
    8.8K
    876
    88
    8.8

When compact notation is specified without an explicit rounding precision, numbers are rounded off to the closest integer after scaling the number by the corresponding power of 10, but with a digit shown after the decimal separator if there is only one digit before the decimal separator. The default compact notation rounding precision is equivalent to:

    Precision::integer().withMinDigits(2)

Returns
  A CompactNotation for passing to the NumberFormatter notation() setter.

Stable:
  ICU 60

## engineering()

static ScientificNotation icu::number::Notation::engineering | ( |  | ) |

static

Print the number using engineering notation, a variant of scientific notation in which the exponent must be divisible by 3.

Example outputs in en-US when printing 8.765E4 through 8.765E-3:

    87.65E3
    8.765E3
    876.5E0
    87.65E0
    8.765E0
    876.5E-3
    87.65E-3
    8.765E-3
    0E0

Returns
  A ScientificNotation for chaining or passing to the NumberFormatter notation() setter.

Stable:
  ICU 60

## scientific()

static ScientificNotation icu::number::Notation::scientific | ( |  | ) |

static

Print the number using scientific notation (also known as scientific form, standard index form, or standard form in the UK).

The format for scientific notation varies by locale; for example, many Western locales display the number in the form "#E0", where the number is displayed with one digit before the decimal separator, zero or more digits after the decimal separator, and the corresponding power of 10 displayed after the "E".

Example outputs in en-US when printing 8.765E4 through 8.765E-3:

    8.765E4
    8.765E3
    8.765E2
    8.765E1
    8.765E0
    8.765E-1
    8.765E-2
    8.765E-3
    0E0

Returns
  A ScientificNotation for chaining or passing to the NumberFormatter notation() setter.

Stable:
  ICU 60

## simple()

static SimpleNotation icu::number::Notation::simple | ( |  | ) |

static

Print the number using simple notation without any scaling by powers of ten.

This is the default behavior.

Since this is the default behavior, this method needs to be called only when it is necessary to override a previous setting.

Example outputs in en-US when printing 8.765E7 through 8.765E0:

    87,650,000
    8,765,000
    876,500
    87,650
    8,765
    876.5
    87.65
    8.765

Returns
  A SimpleNotation for passing to the NumberFormatter notation() setter.

Stable:
  ICU 60

The documentation for this class was generated from the following file:

- i18n/unicode/numberformatter.h