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1991-10-30
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┌────────────────────────────────────────────────────╖
├────────────────────────────────────────────────────╢
│ History of revisions for QCALC -- Quick Calculator ║
├────────────────────────────────────────────────────╢
╘════════════════════════════════════════════════════╝
August 20, 1991 -- 1.00
Completed the initial version of QCALC.
August 21, 1991 -- 1.01
Hacked out a parenthesis bug and a misconception concerning operator
precedence. Added modulus and exponent [to the power] operators (%, ^).
Added detection for division by zero.
August 22, 1991 -- 1.02
Added floating point modulus. Improved argument parsing scheme.
August 24, 1991 -- 1.03
Corrected value reader to recognize + and - value modifiers (ie, +5 and
-2). Added mathematical functions: sin, cos, tan, asin, acos, atan,
sqrt, and abs.
August 27, 1991 -- 1.04
Revised the math function handler, and added the predefined constants pi
and e. (Variables be on their way ...)
August 28, 1991 -- 1.05
Added command line variables. <pant pant> Added two parameter function
parsing and the function hypot. Still buggy.
August 29, 1991 -- 1.06
Victory! Cranked out all (haha sure) variable and multi-parameter
function bugs. Also fixed the limited sign modifying function to accept
more than one modification. (ie, -5 was legal, but --5 wasn't. Now it
is.) Added integer random function, but it stinks a bit.
September 6, 1991 -- 1.07
Added better variable parsing. Variables can now be defined to full
expressions, including references to variables previously defined on the
command line. ie, /valice=100 /vbob=alice*(PI+2)
September 7, 1991 -- 1.08
Improved the appearance of printed variables, and placed the reworked
variable handler in it's own file. Separated text descriptions to a
header file. Essentially, I just trimmed down the main file to a more
manageable size again. Began working on my own number printing
algorithm. Added log, logt, cosh, tanh, sinh. Passed the 1000 line
source code mark.
September 8, 1991 -- 1.09
Once again altered variables. Now, the /V switch is obsolete. To store
an expression result in a variable, just prepend "var=" to it. ie:
bob=100*5 will store 500 in bob. ... AH! Late at night, worked on many
print options! (13 options switches in all now.) **MANY** errors, this
is the buggiest revision. Ick. I'll wade through it tomorrow.
September 9, 1991 -- 1.10
Cranked out several bugs. Added pretty help screens. (Awww...)
September 12, 1991 -- 1.11
More bug cranking. Comma and decimal points switches both now work
properly. Changed /F (list functions) to /L, and added /F (Financial
representation -- turns on /$ /C /D2). Added single argument/multi
parameters: /$CD2 is now a valid switch! (The one exception is the
/S switch -- another switch may never follow it due to the strange
way DOS handles "quotes" as arguments.)
September 13, 1991 (friday) -- 1.12
Hacked apart the main file again -- this sets the stage for adding
environment variables and taking input from files. Also, it cleared
up some problems with multi-parameter single-arguments. /fnordf turns
off the header printer, AND turns on financial number printing.
Documented the switches in QCALC.DOC. Zzzz. Added /DM to allow control
over trailing zeroes and whole numbers. Added "Switch error!" for bad
switches when /EB is on. Corrected /B? changes so that newlines are
printed for clarity when switching from /BA to /BO or /BF. Could be
even clearer...
September 14, 1991 -- 1.13
Worked further on documentation. Added more functions for a total of 4
constants, and 34 functions. Most, however, are trigonometric. Redid
the help screens AGAIN. Added error handlers (floating point exception
division by zero, overflow, domain, and control-c)! They SEEM to work,
but only time will tell ...
September 15, 1991 -- 1.14
Finished documenting 34 functions and most error conditions. More help
screens, testing. Revised QCALC /? switches -- QCALC with no parameters
simply says "type /? for switches", rather than giving the switch list.
Rehacked multi-parameter passing, and added 11 financial functions: sln,
syd, ddb, asln, asyd, addb, pmt, fv, fva, pv and pva. Total of 45
functions and 4 constants. However, for some reason, I don't trust
Howard's financial functions. I may write my own.
September 16, 1991 -- 1.15
Implemented the "Improper number of parameters" error. Split the
gargantuan QCALC.H file into manageable portions. Implemented
percentage printing (/%). Documented the rest of the functions, and
added a lot of the extra garbage one is expected to add to
documentation. I need some beta testers reaaaal soon. Changed the
financial switch so it now "toggles". Changed the /FNORD switch so now
it can be called anywhere from the command line. (ie QCALC 10 /FNORD
now turns off the header.) Wrote several supplement files.
September 17, 1991 -- 1.16
It never ends. Tried to do it simply, but it just can't be done that
way, so I overhauled the argument parser again, making a new function
called "getnextarg" that seems to work pretty neat. The difference is,
this function first checks the environment variable "QCALC", parsing
spaces into nulls, and returning them first. The big problem here was
another discovery about DOS; The set command doesn't allow a = as part
of the string! So, I had to make a decision, and I decided using SET
was more important than the equal sign, so now to assign variables, use
a colon instead of an equal sign. Added the underscore as a valid
symbol character.
September 18, 1991 -- 1.17
ARGH!! Tried to implement @filename, where if its own argument, will
tell QCALC to load the file, and evaluate the expressions in there
before continuing. Was hell. I think I need to do some major hacking.
<sigh> Also redirected all error messages to stderr.
September 19, 1991 -- 1.18
Fixed the @filename command -- sorta -- Extra blank lines or missing
CR's seem to be an ever increasing problem. I'll have to write a system
for handling nulls. (Problem is because of the /BA switch.) Improved
@file reader; now it recognizes a semicolon (;) as a comment, and a
pound sign (#) as a string of text to print to the screen. Added
functions and, or, xor, neg, if, eq, gt, lt, goe, and loe. (Logical and
conditional functions.) Added variables TRUE and FALSE. Over 60
functions and constants!
September 20, 1991 -- 1.19
Added a bunch of internal functions, and reworked the /B and /V switches
to just /O. /O handles all output. Many, many options. Now nulls are
not a problem, but my original problem about separator printing is back.
I guess I'll have to calculate everything before I print it. That will
allow several improvements in the long run, but it'll be hell getting
there.
September 21, 1991 -- 1.20
Fixed some problems with the getnextarg() function. Added strings to
qcalc files. Added the "pause" character (the tilde ~) to script files.
Internal variables are now truly constants -- user definable variables
can be redefined, but internals can't. Symbol names can now include
letters, numbers, and the underscore.
September 22, 1991 -- 1.21
Script files can now be kept in the same directory as QCALC.EXE. If
QCALC can't find the file in the current directory, it will look in the
directory where QCALC resides. Added the !varname argument, which will
prompt the user to input the variable named after the !. Added exponent
reading. (10 can be expressed as 10, 1e1 or 1+e1.) Gave the exponent
operator (^) higher precedence. Added operators & (and), $ and | (not),
> and } (greater than), < and { (less than), >= and }= (greater than or
equal to), <= and {= (less than or equal to). Guess it's ready for
beta-testing -- I wish I had a complete script language, but that's so
advanced, if I started it now, I'll never release QCALC.
Septemeber 23 thru December 4, 1991 -- Bug fixin' time: 1.22
Fixed the /FNORD switch so it isn't case sensitive. Revised the input
routine so it takes it's input directly from the keyboard, rather than
STDIN, prints errors better, and handles backspacing. Corrected some
blaring <snort> errors in the documentation. Added function POW
(exponentation) like I was supposed to have had in there already.
Changed function logt to log10 to reflect new ability of symbols having
digits. Corrected exponent (1e+1) problem. Corrected inputing past the
buffer bug. No longer have to supply a QC extension on script files.
Fixed inability for multiparameter functions to contain a non-
parenthetical expression. Corrected error with commas. Corrected
incorrect DOS errorlevel when inputing from a !var. Released QCALC
(hoorah!).
December 10, 1991 -- 1.23
ARGH! Discovered two major bugs. The first one was a precedence
error that unfortunately returns an incorrect answer in complex
equations using operators with varying precedence. The second was
parenthesis defaulting to multiplication; when a variable followed
a parenthesis such as "(5)a", it would report an error. Corrected
both errors. Prayed that I've fixed all major errors. Re-released
QCALC