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Refactor docs files for bcmath library

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Peter Kokot 2019-04-20 22:41:00 +02:00
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6 changed files with 45 additions and 42 deletions
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ext/bcmath/libbcmath/AUTHORS
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Phil Nelson <philnelson@acm.org> wrote bcmath library.

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ext/bcmath/libbcmath/ChangeLog
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Wed Jun 7 09:39:02 2000 Phil Nelson <phil@cs.wwu.edu>
* configure.in and many others: version number now at 0.2.
Many other changes/additions for getting a distribution
to work.
2000-05-21 Phil Nelson <phil@cs.wwu.edu>
* Initial setup of bcmath library., calling it version 0.1.

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ext/bcmath/libbcmath/FAQ
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BCMATH FAQ:
1) Why BCMATH?
The math routines of GNU bc become more generally useful in a
library form. By separating the BCMATH library from GNU bc,
GNU bc can be under the GPL and BCMATH can be under the LGPL.
2) Why BCMATH when GMP exists?
GMP has "integers" (no digits after a decimal), "rational numbers"
(stored as 2 integers) and "floats". None of these will correctly
represent a POSIX BC number. Floats are the closest, but will not
behave correctly for many computations. For example, BC numbers have
a "scale" that represent the number of digits to represent after the
decimal point. The multiplying two of these numbers requires one to
calculate an exact number of digits after the decimal point regardless
of the number of digits in the integer part. GMP floats have a
"fixed, but arbitrary" mantissa and so multiplying two floats will end
up dropping digits BC must calculate.

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ext/bcmath/libbcmath/NEWS
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NEWS for bcmath library:
May 2000: The library is created.

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ext/bcmath/libbcmath/README
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This is bcmath, a library of arbitrary precision math routines.
These routines, in a different form, are the routines that to
the arbitrary precision calculations for GNU bc and GNU dc.
This library is provided to make these routines useful in a
larger context with less restrictions on the use of them.
These routines do not duplicate functionality of the GNU gmp
library. gmp is similar, but the actual computation is different.

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ext/bcmath/libbcmath/README.md Normal file
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# The bcmath library
This is a fork of the bcmath library initially created by Phil Nelson in May
2010.
Bcmath is a library of arbitrary precision math routines. These routines, in a
different form, are the routines that to the arbitrary precision calculations
for GNU bc and GNU dc.
This library is provided to make these routines useful in a larger context with
less restrictions on the use of them.
These routines do not duplicate functionality of the GNU gmp library. The gmp
library is similar, but the actual computation is different.
Initial library (version 0.1) has been created in 2000-05-21 and then forked and
bundled into PHP with version 0.2 released in 2000-06-07.
## FAQ
* Why BCMATH?
The math routines of GNU bc become more generally useful in a library form. By
separating the BCMATH library from GNU bc, GNU bc can be under the GPL and
BCMATH can be under the LGPL.
* Why BCMATH when GMP exists?
GMP has "integers" (no digits after a decimal), "rational numbers" (stored as
2 integers) and "floats". None of these will correctly represent a POSIX BC
number. Floats are the closest, but will not behave correctly for many
computations. For example, BC numbers have a "scale" that represent the number
of digits to represent after the decimal point. The multiplying two of these
numbers requires one to calculate an exact number of digits after the decimal
point regardless of the number of digits in the integer part. GMP floats have
a "fixed, but arbitrary" mantissa and so multiplying two floats will end up
dropping digits BC must calculate.
## Credits
Phil Nelson (philnelson@acm.org) wrote bcmath library.
## License
The bcmath library is released under the GNU Lesser General Public License v2.1.