| C-Extensions / C-Extension macros | |
Decimals are defined by an encoded length - the total number of significant digits (precision), and the significant digits to the right of the decimal (scale).
The following macros handle decimal length:
| Macro | Description |
|---|---|
| DECLEN(m,n) | Calculates the minimum number of bytes necessary to hold a decimal ( m = precision, n = scale) |
| DECLENGTH(length) | Calculates the minimum number of bytes necessary to hold a decimal, given the encoded length |
| DECPREC(size) | Calculates a default precision, given the size (the number of bytes used to store a number) |
| PRECTOT(length) | Returns the precision from an encoded length |
| PRECDEC(length) | Returns the scale from an encoded length |
| PRECMAKE(p,s) | Returns the encoded decimal length from a precision and scale |