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116 lines
3.4 KiB
Markdown
116 lines
3.4 KiB
Markdown
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/Currency/actions/workflows/arduino-lint.yml)
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[](https://github.com/RobTillaart/Currency/actions/workflows/jsoncheck.yml)
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[](https://github.com/RobTillaart/currency/blob/master/LICENSE)
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[](https://github.com/RobTillaart/currency/releases)
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# Currency
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Arduino library to help formatting integers for printing as currency.
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#### Warning: experimental
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## Description
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The currency library contains a number of functions that help to print
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integers as currency.
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The currency functions assume you do the currency math in integer units.
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For dollars and euro's this would be cents. For numbers with more decimals
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it is a smaller unit.
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Using integers makes addition, subtraction and multiplication of currency exact.
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The library has experimental wrappers for float/double values.
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Not tested extensively yet.
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Choosing int32_t as 'base' also means that there is a limit in terms
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of minimum and maximum values. When large amounts are needed one can
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use the currency64() or one of its derived formatters as this is based
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upon int64_t numbers.
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There is a relation with the printHelpers class - https://github.com/RobTillaart/printHelpers
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When this currency library has matured it might be merged with printHelpers.
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## Interface
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The following functions are implemented:
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### Core function
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- **char \* currency(int32_t value, uint8_t decimals, char decimalSeparator, char thousandSeparator, char symbol);**
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- **char \* currency64(int64_t value, uint8_t decimals, char decimalSeparator, char thousandSeparator, char symbol);**
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### int32 Wrapper functions
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- **char \* bitcoin(int32_t value)**
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- **char \* dollar(int32_t value)**
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- **char \* euro(int32_t value)**
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- **char \* pound(int32_t value)**
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- **char \* roubles(int32_t value)**
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- **char \* yen(int32_t value)**
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- **char \* yuan(int32_t value)**
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### int64 Wrapper functions
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- **char \* bitcoin64(int64_t value)**
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- **char \* dollar64(int64_t value)**
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- **char \* euro64(int64_t value)**
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- **char \* pound64(int64_t value)**
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- **char \* roubles64(int64_t value)**
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- **char \* yen64(int64_t value)**
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- **char \* yuan64(int64_t value)**
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### float Wrapper functions
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Experimental - not tested
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All assumes 2 decimals except bitcoin which has 6.
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- **char \* bitcoinf(double value)**
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- **char \* dollarf(double value)**
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- **char \* eurof(double value)**
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- **char \* poundf(double value)**
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- **char \* roublesf(double value)**
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- **char \* yenf(double value)**
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- **char \* yuanf(double value)**
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## Operation
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See examples.
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## Performance
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Performance is hard to optimize. Most time is spend in splitting
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individual digits (div / mod 10).
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## Future
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#### must
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- update documentation.
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#### should
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#### could
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- More wrapper functions?
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- test double parameters.
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- should decimals be a parameter too?
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- add BTC, USD, EUR, GBP, RUB, JPY, CNY, etc. (3+1 chars)
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- https://www.easymarkets.com/eu/learn-centre/discover-trading/currency-acronyms-and-abbreviations/
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#### won't
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- currency conversion?
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- intern all in ???
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