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What does this mean???

I got a small programm on net...but there was different initialisation
that I saw...

It was as follows:

for ( i = ~0 ; i ; i>>=1);

right shift is ok..But what is meaned by " i = ~0 "...

Jun 19 '07 #1
26 1998
Shraddha wrote:
I got a small programm on net...but there was different initialisation
that I saw...

It was as follows:

for ( i = ~0 ; i ; i>>=1);

right shift is ok..But what is meaned by " i = ~0 "...
Same as "i = -1;" I suppose.

--
Joe Wright
"Everything should be made as simple as possible, but not simpler."
--- Albert Einstein ---
Jun 19 '07 #2
"Shraddha" writes:
>I got a small programm on net...but there was different initialisation
that I saw...

It was as follows:

for ( i = ~0 ; i ; i>>=1);

right shift is ok..But what is meaned by " i = ~0 "...
Tilde is the one's complement operator. I would not think of that as
bulletproof code, the results might well be different on a one's complement
machine than they are on a two's complement machine. The result is
"negative zero" on a one's complement machine.
Jun 19 '07 #3
On Mon, 18 Jun 2007 20:28:36 -0400, Joe Wright
<jo********@com cast.netwrote:
>Shraddha wrote:
>I got a small programm on net...but there was different initialisation
that I saw...

It was as follows:

for ( i = ~0 ; i ; i>>=1);

right shift is ok..But what is meaned by " i = ~0 "...
Same as "i = -1;" I suppose.
Not on a 1's complement or a signed magnitude machine.
Remove del for email
Jun 19 '07 #4
osmium said:

<snip>
Tilde is the one's complement operator.
Actually, it's the ones' complement operator, because it complements
many ones. "Two's complement", however, is correct.

--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999
http://www.cpax.org.uk
email: rjh at the above domain, - www.
Jun 19 '07 #5
"Richard Heathfield" writes:
osmium said:

<snip>
>Tilde is the one's complement operator.

Actually, it's the ones' complement operator, because it complements
many ones. "Two's complement", however, is correct.
I don't know if that is some of that famous British humour or what. It is
the one's complement operator, it does *not* form a proper two's complement.
Jun 19 '07 #6
osmium said:
"Richard Heathfield" writes:
>osmium said:

<snip>
>>Tilde is the one's complement operator.

Actually, it's the ones' complement operator, because it complements
many ones. "Two's complement", however, is correct.

I don't know if that is some of that famous British humour or what.
Nope.
It is the one's complement operator,
No, it's the ones' complement operator. Observe the position of the
apostrophe. If you disagree, take it up with Knuth (TAOCP Vol 2,
Section 4.1).
it does *not* form a proper two's complement.
I didn't say it did. I was referring to your correct positioning of the
apostrophe in "two's complement", later in your article.

--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999
http://www.cpax.org.uk
email: rjh at the above domain, - www.
Jun 19 '07 #7
"Richard Heathfield" writes:
>
osmium said:
>
>"Richard Heathfield" writes:
>>osmium said:

<snip>

Tilde is the one's complement operator.

Actually, it's the ones' complement operator, because it complements
many ones. "Two's complement", however, is correct.

I don't know if that is some of that famous British humour or what.

Nope.
>It is the one's complement operator,

No, it's the ones' complement operator. Observe the position of the
apostrophe. If you disagree, take it up with Knuth (TAOCP Vol 2,
Section 4.1).
>it does *not* form a proper two's complement.

I didn't say it did. I was referring to your correct positioning of the
apostrophe in "two's complement", later in your article.
Some of your alleged humour is on a par with your food. If I had not
responded an innocent passerby who didn't try to parse your response, as I
did, could be misled badly.
Jun 19 '07 #8
osmium said:
"Richard Heathfield" writes:
>>
osmium said:
>>
>>"Richard Heathfield" writes:

osmium said:

<snip>

Tilde is the one's complement operator.

Actually, it's the ones' complement operator, because it
complement s many ones. "Two's complement", however, is correct.

I don't know if that is some of that famous British humour or what.

Nope.
>>It is the one's complement operator,

No, it's the ones' complement operator. Observe the position of the
apostrophe. If you disagree, take it up with Knuth (TAOCP Vol 2,
Section 4.1).
>>it does *not* form a proper two's complement.

I didn't say it did. I was referring to your correct positioning of
the apostrophe in "two's complement", later in your article.

Some of your alleged humour is on a par with your food.
I say again, there is no humour intended here. I am being perfectly
serious. I don't know what amusement *you* see in this discussion, but
I'm not seeing any at all.
If I had not
responded an innocent passerby who didn't try to parse your response,
as I did, could be misled badly.
I don't see how. You said "Tilde is the one's complement operator" and I
replied "No, it's the ones' complement operator". The correction seems
plain enough to me.

If you think my correction is spurious, I invite you to check the Knuth
reference I gave.

--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999
http://www.cpax.org.uk
email: rjh at the above domain, - www.
Jun 19 '07 #9
"Richard Heathfield" wrote:
osmium said:
>"Richard Heathfield" writes:
>>>
osmium said:
>>>
"Richard Heathfield" writes:

osmium said:
>
<snip>
>
>Tilde is the one's complement operator.
>
Actually, it's the ones' complement operator, because it
complemen ts many ones. "Two's complement", however, is correct.

I don't know if that is some of that famous British humour or what.

Nope.

It is the one's complement operator,

No, it's the ones' complement operator. Observe the position of the
apostrophe. If you disagree, take it up with Knuth (TAOCP Vol 2,
Section 4.1).

it does *not* form a proper two's complement.

I didn't say it did. I was referring to your correct positioning of
the apostrophe in "two's complement", later in your article.

Some of your alleged humour is on a par with your food.

I say again, there is no humour intended here. I am being perfectly
serious. I don't know what amusement *you* see in this discussion, but
I'm not seeing any at all.
>If I had not
responded an innocent passerby who didn't try to parse your response,
as I did, could be misled badly.

I don't see how. You said "Tilde is the one's complement operator" and I
replied "No, it's the ones' complement operator". The correction seems
plain enough to me.

If you think my correction is spurious, I invite you to check the Knuth
reference I gave.
It has nothing to do with the legitimacy of what you are saying. You know,
this English language is expressive enough to actually say what you mean
instead of hiding the meaning behind a veil. I see no point whatsoever in
being so subtle on such a thing, as I said, your initial post could easily
mislead someone.

FWIW, K&R spell it my way. My work is done here.
Jun 19 '07 #10

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