Currency: what changed
Revision 0 to 1. Removed lines have a minus sign; added lines have a plus sign.
Title: Currency
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| 1 | + | The `Currency` type is a real [[Data type|data type]] with 4 digits to the right of the decimal point and a range of -922337203685477.5808 to 922337203685477.5807 . The purpose of the `Currency` data type is to give arithmetic results that exactly correspond to decimal calculations on the input values. | |
| 2 | + | ||
| 3 | + | Real values are normally stored in the [[Binary numeral system|binary number system]] internally, and calculations are performed in the CPU in binary arithmetic. Since humans desire input and output numbers to be in decimal number format, there must be a conversion made between external decimal numbers and their binary internal representation. As a result of the conversion to/from binary numbers and the calculations being done in binary arithmetic, the results of normal real arithmetic can differ from a decimal arithmetic calculation. This discrepancy is not critical in many applications, but *financial applications* want their arithmetic operations to match a decimal arithmetic calculation. The `currency` data type is designed to give arithmetic results corresponding to decimal arithmetic on the real values given. | |
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| 5 | + | ## See also | |
| 6 | + | ||
| 7 | + | - [[Function|function]] [`CurrToStr`](https://www.freepascal.org/docs-html/rtl/sysutils/currtostr.html) | |
| 8 | + | - function [`FormatCurr`](https://www.freepascal.org/docs-html/rtl/sysutils/formatcurr.html) | |
| 9 | + | - function [`StrToCurr`](https://www.freepascal.org/docs-html/rtl/sysutils/strtocurr.html) | |
| 10 | + | ||
| 11 | + | --- | |
| 12 | + | *From the Free Pascal wiki, page "Currency", as it stood on 2022-05-26 after a change by Trev, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's [[Licensing]] page. If you have concerns about this material, [message the admin](/wiki-contact).* |