The package can be installed through Quicklisp: (ql:quickload "decimals")
Link to the package source code and README file: DECIMALS.
This package introduces three public functions and one macro. See their own documentation for complete description. Here's a short introduction.
Function: PARSE-DECIMAL-NUMBER (string &key ...)
Examine a string for a decimal number and return it as a rational number.
DECIMALS> (parse-decimal-number "12,34" :decimal-separator #\,) 617/50
Function: FORMAT-DECIMAL-NUMBER (number &key ...)
Apply specified decimal number formatting rules to a number and return a formatted string.
DECIMALS> (format-decimal-number 20000/3 :round-magnitude -3
:decimal-separator ","
:integer-group-separator " "
:integer-minimum-width 7)
" 6 666,667"
("" "6 666" "," "667")
DECIMALS> (loop for e from -5 upto 5
do (print (format-decimal-number
(expt 10 e) :round-magnitude -5
:decimal-separator ","
:integer-minimum-width 7
:integer-group-separator " "
:fractional-minimum-width 7
:fractional-group-separator " ")))
" 0,000 01"
" 0,000 1 "
" 0,001 "
" 0,01 "
" 0,1 "
" 1 "
" 10 "
" 100 "
" 1 000 "
" 10 000 "
"100 000 "
NIL
Function: ROUND-HALF-AWAY-FROM-ZERO (number &optional (divisor 1))
A rounding function similar to CL:ROUND except that when number is exactly half-way between two integers round always away from zero. FORMAT-DECIMAL-NUMBER uses this rounding function by default.
Macro: DEFINE-DECIMAL-FORMATTER (name &body keyword-arguments)
Define a custom decimal number formatter function suitable for the ~/ directive of CL:FORMAT.
This page is linked from: DECIMAL-NUMBER
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