Happened to see my old (last millennium) c code. Almost forgot that I
wrote it .
It is interesting. :-)
int sqrt(int no)
{
int t;
no = t * t;
return t;
}
Nov 16 '06
26  3650 
In article <11************ **********@h54g 2000cwb.googleg roups.com"=?utf-8?B?SGFyYWxkIHZ hbiBExLNr?=" <tr*****@gmail. comwrites:
Richard Bos wrote:
August Karlstrom <fu********@com hem.sewrote:
....
I'd say: "...hasn't been exposed to C's unfortunate choice of symbol for
assignment". ;-)
You could say that, but don't more than half of all programming
languages which are used in practice (i.e., Intercal and Plankalkuel
don't count) share that choice of symbol?
How many of those have copied their operators from C?
I would rather say that C has copied it from other languages (the use
of '=' for assignment). I think Fortran was the first.
--
dik t. winter, cwi, kruislaan 413, 1098 sj amsterdam, nederland, +31205924131
home: bovenover 215, 1025 jn amsterdam, nederland; http://www.cwi.nl/~dik/
In article <Si************ ******@newsb.te lia.netAugust Karlstrom <fu********@com hem.sewrites:
....
Mathematics Pascal/Modula/Oberon C
x = y x equals y x equals y x becomes y
1/2 0.5 0.5 0
The second line is incorrect for Mathematics if you are not working in
the reals.
--
dik t. winter, cwi, kruislaan 413, 1098 sj amsterdam, nederland, +31205924131
home: bovenover 215, 1025 jn amsterdam, nederland; http://www.cwi.nl/~dik/
CBFalconer wrote:
Harald van D?k wrote:
Richard Bos wrote:
August Karlstrom <fu********@com hem.sewrote:
Keith Thompson skrev:
To someone who knows what "=" means in mathematics, but hasn't
been exposed to the concept of assignment, it's not an entirely
insane misconception.
I'd say: "...hasn't been exposed to C's unfortunate choice of
symbol for assignment". ;-)
You could say that, but don't more than half of all programming
languages which are used in practice (i.e., Intercal and
Plankalkuel don't count) share that choice of symbol?
How many of those have copied their operators from C?
Which in turn copied its silly assignment operator from Fortran.
Or more directly, from B, I imagine. But where C got it from is not
really relevant to my point.
Dear Mr Richard.. I asked out of curiosity to vijayakumar ..
And he might have got it that the question was meant to him.
Richard Heathfield wrote:
Dh*********@gma il.com top-posted, but I've fixed that. He said:
v4vijayakumar wrote:
Happened to see my old (last millennium) c code. Almost forgot that I
wrote it .
It is interesting. :-)
int sqrt(int no)
{
int t;
no = t * t;
return t;
}
Can u tell me what is interesting in this code ??
No, there isn't any regular comp.lang.c contributor called "u".
(Translation: abbreviating "you" to "u" marks you out as someone who can't
even spell "you" properly. Take the time to type "you" in full, in the
interests of clear communication and of not looking idiotic.)
Here are the principal points of interest:
1) function name choice invades implementation namespace, thus invoking
undefined behaviour;
2) function name choice gives a misleading impression of what the function
tries to do;
3) t's value is indeterminate, but the function still attempts to use t's
value regardless, thus invoking undefined behaviour;
4) a parameter is used solely for assigning a value to, and this value will
be lost at the same time that the parameter itself is lost, at the end of
this function;
5) an indeterminate value is returned from this function, thus invoking
undefined behaviour in any caller that evaluates it;
6) even if all those faults were fixed, the function would still need major
repair work (type choices, range validation, etc).
Summary: it was written by someone who didn't know C very well six or seven
years ago. Whether they have learned their lessons in the meantime, I
cannot say.
--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999
http://www.cpax.org.uk
email: normal service will be restored as soon as possible. Please do not
adjust your email clients.
Dh*********@gma il.com said:
Dear Mr Richard.. I asked out of curiosity to vijayakumar ..
And he might have got it that the question was meant to him.
If you wish to direct a communication to a specific individual, I recommend
email as the best medium. The comp.lang.c newsgroup is an international
newsgroup, not a private bulletin board.
--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999 http://www.cpax.org.uk
email: rjh at the above domain, - www.
Dik T. Winter skrev:
In article <Si************ ******@newsb.te lia.netAugust Karlstrom <fu********@com hem.sewrites:
...
Mathematics Pascal/Modula/Oberon C
x = y x equals y x equals y x becomes y
1/2 0.5 0.5 0
The second line is incorrect for Mathematics if you are not working in
the reals.
Well, it's just as valid for the rational numbers (Q is a field).
In the ring of integers, division is not defined for every number (not
every integer has a multiplicative inverse).
August
--
"Programmin g languages like C make people really believe that one half
equals zero." -- A. Karlstrom
In article <Vx************ ******@newsb.te lia.netAugust Karlstrom <fu********@com hem.sewrites:
Dik T. Winter skrev:
In article <Si************ ******@newsb.te lia.netAugust Karlstrom <fu********@com hem.sewrites:
...
Mathematics Pascal/Modula/Oberon C
x = y x equals y x equals y x becomes y
1/2 0.5 0.5 0
The second line is incorrect for Mathematics if you are not working in
the reals.
Well, it's just as valid for the rational numbers (Q is a field).
In the ring of integers, division is not defined for every number (not
every integer has a multiplicative inverse).
So, C defines division in the integers (as the truncating variant). What
is wrong with that? But, whatever, both semantics above of '=' and '/'
are indirectly from Fortran. You should know the off-spring of programming
languages to understand that. Algol 58 (never really defined) took it from
Fortran. And Algol 58 begot Jovial, which begot CPL, which begot BCPL,
which begot B, which begot C. Algol 58 also begot Algol 60 (which changed
use), which in turn begot Pascal/Modula/Oberon. And the very first
assembly language I did learn also used '=' for assignment:
S = M[A]
which meant: fetch the contents of memory location A and store it in
register S. To get the condition bit set when the two were equal you
used:
U, S - M[A], Z
--
dik t. winter, cwi, kruislaan 413, 1098 sj amsterdam, nederland, +31205924131
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