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FIDO MESSAGE AREA==> TOPIC: 203 C++ Ref: F2F00014 Date: 02/05/98
From: MATHIEU BOUCHARD Time: 12:30am
\/To: JASON PETTY (Read 2 times)
Subj: door library for c++
JP> anyone know where a good door library for making door games thats
JP> freeware for c++?
i don't know but if you're talking specifically about dos, then make
sure it uses the FOSSIL driver; there are lots of doors that simply
won't work just because you have a weird modem setup (irq's) and the
programmer's endless pride told him to write everything from scratch,
ending up with a crappy modem driver separate in every single door,
each of which crashing the whole machine once every 2 weeks, when
functioning at all (several doors didn't support over com2:, some
others didn't support alternate irq's, and most of all doors didn't
support multimodem cards)
now a door game interface would just be a layer on the top of this that
allows for easy manipulation of common terminal protocols such as
ansi/vt-100, avatar, rip, and also doorfiles, user privileges, user
time limit, user names, and such?
is this for personal use or wide use? would you mind using instead a
script language like MEX which is embedded into Maximus?
matju
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FIDO MESSAGE AREA==> TOPIC: 203 C++ Ref: F2F00015 Date: 02/05/98
From: MATHIEU BOUCHARD Time: 12:48am
\/To: ROBERT DAVIES (Read 2 times)
Subj: I do not under srand this can anyone enl00:48:2702/05/98
RD> understand. If you have a look at lines nine and ten
RD> cout << 1.e3 << endl; // 1000
RD> cout << 1.e-3 << endl; // 0.001
RD> Does 1.e3 mean one multiplied by a thousand, and 1.e-3 mean one
RD> multiplied by
RD> minus a thousand?
yes. it's scientific notation. e2 is *100, e1 is *10, e0 does nothing,
e-2 does /100, e/5 does /10000, e12 does *1000000000000, and so on. In
scientific notation, at the right of the e stands a number which is
used as an exponent to the current base (10) and multiplied by the
number at the left of the e which is called the mantissa.
incidentally, floating point processors use a similar scheme to store
and compute values. a 'float' number has something like 23 bits of
mantissa which is always in the interval 0.5 < x < 1 (either that or 1
< x < 2) and an exponent of 8 bits that goes from -128 to +127 or
nearly that; the base is 2. there is one sign bit and that sums up to a
total of 32 bits.
another standard is the 'double' format, 64-bit (52,11,1). other
formats are optional and/or redundant. Long ago, several large
companies had their own formats. Also, the 'long double' format on PC's
is 80 bits (63,15,1, and 1 bit wasted), but is not guaranteed of
existing (or being the same) on other machines, where the biggest might
be 64 bit, or 96 bit, or 128 bit.
matju
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FIDO MESSAGE AREA==> TOPIC: 203 C++ Ref: F2F00016 Date: 02/05/98
From: MATHIEU BOUCHARD Time: 12:57am
\/To: TIM HUTZLER (Read 2 times)
Subj: Re: sending AT commands
TH> JDBP>ofstream modem("COM3", ios::out|ios::binary) ;
TH> JDBP>modem << "ATZ\r" << flush ;
TH> Thanks, I tried that out. But I get a linker error.
TH> I am compiling for DOS. I am using Borland 3.0 for DOS.
TH> What I would like to see is a simple application demonstrating a
TH> functional, working example of manipulating the modem. I only need to
TH> send AT-dialing commands to automate banking transactions and such.
Though the error is not related to what i'm saying, consider using a
Fossil driver. The com port device pseudofiles com1: through com8: are
quirky under DOS and shouldn't be used for serious purposes. On the
other hand, rewriting the stuff is long, takes serious debugging time
and isn't very good. Using a library is not as stable as using a
driver, especially since some drivers, like BNU, were thoroughly tested
and this one is probably still popular (EVEN THOUGH there were no
official versions since 1989 -- the 1.70 release was really stable).
Using a C library might be easier, though, especially if stability is
not your greatest concern, which is probably the case..
Another solution, which is probably the best suited to your particular
problem: If you're using a telecom package such as Telix or Terminate,
there's an embedded script language. Telix's SALT looks like a
simplified C; Terminate's language looks like a blend of pascal, basic,
and C. I couldn't give more details, because i don't remember much of
it.
matju
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FIDO MESSAGE AREA==> TOPIC: 203 C++ Ref: F2F00017 Date: 02/05/98
From: MATHIEU BOUCHARD Time: 01:11am
\/To: ADAM MAJER (Read 2 times)
Subj: converting char to string
AM> HB>char charvar;
AM> HB>char stringvar[90];
AM> HB>char stringret[91];
AM> HB>sprintf(stringret, "%s%c", stringvar, charvar);
AM> This takes a long time to execute though
AM> int i = strlen(stringvar);
AM> stringvar[i++] = charvar;
AM> stringvar[i] = NULL;
AM> The above is much faster. ;-)
Yet Another Way To Do It <tm>:
sprintf(stringvar + strlen (stringvar), "%c", charvar);
matju
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FIDO MESSAGE AREA==> TOPIC: 203 C++ Ref: F2F00018 Date: 02/05/98
From: MATHIEU BOUCHARD Time: 01:15am
\/To: JONATHAN DE BOYNE POLLARD (Read 2 times)
Subj: Sort Algorithm
DN>> Note that bubble sort is offered by Knuth, and several others, as by
DN>> far the worst sorting algorithm around. The next step up is insertion
DN>> sort, which typically runs twice as fast. The "great all-rounder" is
DN>> Shell's algorithm. The "formula 1 racer" is Hoare's algorithm
DN>> (usually very fast, but is prone to breaking down). The "status
DN>> symbol" of sorting is Batcher's algorithm.
JdBP> Whenever I need to code a sort of my own (as opposed to just using
JdBP> qsort()) I
JdBP> use Comb Sort. It's reasonably fast, and it is uncomplicated and
small
JdBP> enough that it is easy to remember.
what is the comb sort? and Batcher's algorithm? (in short... just the
algorithms in pseudocode, details are ok but not necessary)
matju
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FIDO MESSAGE AREA==> TOPIC: 203 C++ Ref: F2F00019 Date: 02/05/98
From: MATHIEU BOUCHARD Time: 01:19am
\/To: JONATHAN DE BOYNE POLLARD (Read 2 times)
Subj: converting char to string
JdBP> Or, idiomatically :
JdBP> char ch ;
JdBP> char str[2] = { ch } ;
does that guarantee that str[1] == 0 ?
matju
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FIDO MESSAGE AREA==> TOPIC: 203 C++ Ref: F2F00020 Date: 02/05/98
From: MATHIEU BOUCHARD Time: 01:24am
\/To: BRIAN WOOD (Read 2 times)
Subj: '/a'=?
BW> No, no error, and '/a' is what I meant, but I think you're right. A
BW> compiler should post an error or at least a warning, IMHO. I started
BW> using two char constants a couple years ago, not realizing it was a bad
BW> idea, and not at all portable evidently... Now I'd like to rewrite all
BW> the code that uses this type, and I'm looking for the best way.
in Perl language,
while (<>) { print if /'..+'/; }
will find all of your '' pairs with 2 chars or more in them...
the pattern should be a little more elaborate because it currently
doesn't care for cases where you got two ' pairs on the same line, and
will match the second and third, and doesn't handle comments, but it's
probably much better than just searching for single apostrophes :-)
incidentally, it's even shorter in awk language:
/'..+'/ { print }
and even shorter in sed language, though i don't remember the syntax.
Since both Perl and Awk are much influenced by C/C++ syntax (at least
at a larger scale than this problem), this is about 40% on topic :-)
Also, you can use Grep, either the GNU one or the Turbo (Borland) one
that comes with every TC or BC.
matju
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FIDO MESSAGE AREA==> TOPIC: 203 C++ Ref: F2F00021 Date: 02/05/98
From: MATHIEU BOUCHARD Time: 01:33am
\/To: ERIC LONDAITS (Read 2 times)
Subj: sort.cpp
EL> I just compiled it and works for me...
CF>> void main()
EL> I would do
EL> void main(void)
EL> but then, that's just me... :) if your compiler doesn't complain it
EL> shouldn't be reason enought for the program to stop execution.
the correct and idiomatic way of writing a main when you don't use any
parameters is:
/* K&R C */
main () {
/* ANSI C */
int main (void) {
// C++
int main () {
when you do use parameters, it's:
/* K&R C */
main (argc,argv)
char *argv[];
{
/* ANSI C, all C++ */
int main (int argc, char *argv[]) {
though **argv is considered correct.
return type is always int. you return 0 if the program is correct.
assign a non-zero value to each error situation your batchfiles should
know about. Most programs giving a visual result should always return 0
since almost never will their values be useful to batchfiles, but i say
*most*.
incidentally, in Java, though not a direct evolution of C/C++, uses the
following syntax:
public static void main (String[] args) {
which means that someone at Sun Microsystems hates batchfiles.
matju
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FIDO MESSAGE AREA==> TOPIC: 203 C++ Ref: F2F00022 Date: 02/05/98
From: MATHIEU BOUCHARD Time: 01:44am
\/To: CYBER CON (Read 2 times)
Subj: C++ Saveding stuff
CC> so could someone write me a exp. program that does the following.
CC> input "Enter Name " , name$
CC> if name$ = "Cyber Con" then print "Hi Cyber Con"
CC> open "file1.fil" as 1
CC> put 1, name$
CC> Close
CC> END
CC> //' next program
CC> open "file1.fil" as 1
CC> get 1, name$
CC> print name$
CC> END
for that kind of thing use Perl instead; C/C++ is better suited for
heavy-duty calculations such as image processing, sound processing,
operating systems, interpreters, ...
in classic C++:
#include <iostream.h>
int main () {
cout << "Enter Name ";
char name[80];
cin >> name;
if (strcmp (name, "Cyber Con") == 0) cout << "Hi Cyber Con\n";
ofstream f1("file1.fil");
f1 << name << "\n";
return 0;
}
in Perl:
print "Enter Name "; flush stdout;
$_ = <>;
print "Hi $_" if /Cyber Con/;
open F1 ">file1.fil";
print F1 "$_\n";
close F1;
in sh language:
echo Enter Name:
read name
if [ "$name" == "Cyber Con" ]; then echo Hi $name; fi
echo $name > file1.fil
the 2nd part, C++:
int main () {
ifstream f1("file1.fil");
char name[80];
f1 >> name;
cout << name << '\n';
return 0;
}
in Perl:
open F1 "file1.fil";
print scalar(<F1>);
close F1;
in sh language:
head -1 file1.fil
or assuming there's really only 1 line in that file:
cat file1.fil
matju
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FIDO MESSAGE AREA==> TOPIC: 203 C++ Ref: F2F00023 Date: 02/05/98
From: MATHIEU BOUCHARD Time: 02:19am
\/To: RON BASS (Read 2 times)
Subj: Re: converting char to string
MB>> NULL is defined as being of type void *.
RB> This may be true in C, but in C++, if NULL is defined at all it is
.
.
.
RB> Under C++, the constant integer 0 is the only valid way to represent a
RB> NULL pointer that can be used with any type of pointer.
thank you very much for this precious info
matju
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