MESSAGE
| DATE | 2016-03-06 |
| FROM | Asia Suarez
|
| SUBJECT | Re: [Hangout-NYLXS] Announcement: Workshop Organizational Meeting
|
From hangout-bounces-at-nylxs.com Sun Mar 6 23:38:14 2016
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References: <56DB9C63.7050505-at-panix.com>
<56DBB62D.20402-at-panix.com>
<98FBA888-C722-49AC-9AF8-628717031817-at-nyu.edu>
<56DBD333.5070700-at-mrbrklyn.com>
<56DD00AE.7020300-at-panix.com>
Date: Sun, 6 Mar 2016 23:31:14 -0500
Message-ID:
From: Asia Suarez
To: NYLXS Discussions List
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Subject: Re: [Hangout-NYLXS] Announcement: Workshop Organizational Meeting
tomorrow 7:00PM
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From what I understand, this is sort of a visual representation of what's
happening:
int array[4]= {1,2,3,4};
Memory Address || Value||
1 || 1 ||
2 || 2 ||
3 || 3 ||
4 || 4 ||
(Arbitrary values for address are chosen, but the point is that they are
all contiguous values, meaning, one right after the other. )
int* matrix = array +1;
Memory Address || Value||
102 || 2 ||
103 || 3 ||
104 || 4 ||
105 ||56fx1 || <-----This value was never initialized
Again memory is contiguous, but we access a memory address that we had not
initialized due to the (+1).
On Sun, Mar 6, 2016 at 11:21 PM, Asia Suarez wrote:
> so the value: -1076361972 that you see is a value that is stored in the
> next piece of contiguous memory following the specific memory wherever the
> matrix pointer points.
>
> On Sun, Mar 6, 2016 at 11:16 PM, Ruben Safir wrote:
>
>> #include
>>
>> int main(int argv, char * argc )
>> {
>> int array[4]= {1,2,3,4};
>> unsigned int i;
>> for(i=0; i<4; i++)
>> {
>> printf("%d\t", array[i]);
>> }
>>
>> printf("\n");
>> int* matrix = array +1;
>> for(i=0; i<4; i++)
>> {
>> printf("%d\t", matrix[i]);
>> }
>> return 0;
>> }
>>
>>
>> ruben-at-www:~> gcc asia.c
>> ruben-at-www:~> ./a.out
>> 1 2 3 4
>> 2 3 4 -1076361972 ruben-at-www:~>
>>
>> What happened here?
>> _______________________________________________
>> hangout mailing list
>> hangout-at-nylxs.com
>> http://www.nylxs.com/
>>
>
>
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From what I understand, this is sort of a visual representation of
what's happening:
int array[4]= {1,2,3,4}; ? ? ? ? ?
? Memory Address || Value||?
? 1 ? ? ? ? ? ? ? || 1 ? ? ? ||
? 2 ? ? ? ? ? ? ? || 2 ? ? ? ||
? 3 ? ? ? ? ? ? ? || 3 ? ? ? ||
? 4 ? ? ? ? ? ? ? || 4 ? ? ? ||
(Arbitrary values for address are chosen, but the point is that they
are all contiguous values, meaning, one right after the other. )
int* matrix = array +1;
? Memory Address || Value||
102 ? ? ? ? ? ? ? || 2 ? ? ? ||
103 ? ? ? ? ? ? ? || 3 ? ? ? ||
104 ? ? ? ? ? ? ? || 4 ? ? ? ||
105 ? ? ? ? ? ? ? ||56fx1 || <-----This value was never
initialized
Again memory is contiguous, but we access a memory address that we had
not initialized due to the (+1).
On Sun, Mar 6, 2016 at 11:21 PM, Asia Suarez <[1]as9795-at-nyu.edu> wrote:
so the value:? -1076361972 ? that you see is a value that is stored in
the next piece of contiguous memory following the specific memory
wherever the matrix pointer points.?
On Sun, Mar 6, 2016 at 11:16 PM, Ruben Safir <[2]mrbrklyn-at-panix.com>
wrote:
#include
? int main(int argv, char * argc )
{
? ? int array[4]= {1,2,3,4};
? ? unsigned int i;
? for(i=0; i<4; i++)
? {
? printf("%d\t", array[i]);
? }
? printf("\n");
? int* matrix = array +1;
? for(i=0; i<4; i++)
? {
? ? printf("%d\t", matrix[i]);
? }
? return 0;
}
ruben-at-www:~> gcc asia.c
ruben-at-www:~> ./a.out
1? ? ? ? 2? ? ? ? 3? ? ? ? 4
2? ? ? ? 3? ? ? ? 4? ? ? ? -1076361972? ? ? ruben-at-www:~>
What happened here?
_______________________________________________
hangout mailing list
[3]hangout-at-nylxs.com
[4]http://www.nylxs.com/
References
1. mailto:as9795-at-nyu.edu
2. mailto:mrbrklyn-at-panix.com
3. mailto:hangout-at-nylxs.com
4. http://www.nylxs.com/
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_______________________________________________
hangout mailing list
hangout-at-nylxs.com
http://www.nylxs.com/
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From what I understand, this is sort of a visual representation of what's
happening:
int array[4]= {1,2,3,4};
Memory Address || Value||
1 || 1 ||
2 || 2 ||
3 || 3 ||
4 || 4 ||
(Arbitrary values for address are chosen, but the point is that they are
all contiguous values, meaning, one right after the other. )
int* matrix = array +1;
Memory Address || Value||
102 || 2 ||
103 || 3 ||
104 || 4 ||
105 ||56fx1 || <-----This value was never initialized
Again memory is contiguous, but we access a memory address that we had not
initialized due to the (+1).
On Sun, Mar 6, 2016 at 11:21 PM, Asia Suarez wrote:
> so the value: -1076361972 that you see is a value that is stored in the
> next piece of contiguous memory following the specific memory wherever the
> matrix pointer points.
>
> On Sun, Mar 6, 2016 at 11:16 PM, Ruben Safir wrote:
>
>> #include
>>
>> int main(int argv, char * argc )
>> {
>> int array[4]= {1,2,3,4};
>> unsigned int i;
>> for(i=0; i<4; i++)
>> {
>> printf("%d\t", array[i]);
>> }
>>
>> printf("\n");
>> int* matrix = array +1;
>> for(i=0; i<4; i++)
>> {
>> printf("%d\t", matrix[i]);
>> }
>> return 0;
>> }
>>
>>
>> ruben-at-www:~> gcc asia.c
>> ruben-at-www:~> ./a.out
>> 1 2 3 4
>> 2 3 4 -1076361972 ruben-at-www:~>
>>
>> What happened here?
>> _______________________________________________
>> hangout mailing list
>> hangout-at-nylxs.com
>> http://www.nylxs.com/
>>
>
>
--94eb2c030e205f64fc052d6defa8
MIME-Version: 1.0
Content-Type: text/plain; charset="UTF-8"
From what I understand, this is sort of a visual representation of
what's happening:
int array[4]= {1,2,3,4}; ? ? ? ? ?
? Memory Address || Value||?
? 1 ? ? ? ? ? ? ? || 1 ? ? ? ||
? 2 ? ? ? ? ? ? ? || 2 ? ? ? ||
? 3 ? ? ? ? ? ? ? || 3 ? ? ? ||
? 4 ? ? ? ? ? ? ? || 4 ? ? ? ||
(Arbitrary values for address are chosen, but the point is that they
are all contiguous values, meaning, one right after the other. )
int* matrix = array +1;
? Memory Address || Value||
102 ? ? ? ? ? ? ? || 2 ? ? ? ||
103 ? ? ? ? ? ? ? || 3 ? ? ? ||
104 ? ? ? ? ? ? ? || 4 ? ? ? ||
105 ? ? ? ? ? ? ? ||56fx1 || <-----This value was never
initialized
Again memory is contiguous, but we access a memory address that we had
not initialized due to the (+1).
On Sun, Mar 6, 2016 at 11:21 PM, Asia Suarez <[1]as9795-at-nyu.edu> wrote:
so the value:? -1076361972 ? that you see is a value that is stored in
the next piece of contiguous memory following the specific memory
wherever the matrix pointer points.?
On Sun, Mar 6, 2016 at 11:16 PM, Ruben Safir <[2]mrbrklyn-at-panix.com>
wrote:
#include
? int main(int argv, char * argc )
{
? ? int array[4]= {1,2,3,4};
? ? unsigned int i;
? for(i=0; i<4; i++)
? {
? printf("%d\t", array[i]);
? }
? printf("\n");
? int* matrix = array +1;
? for(i=0; i<4; i++)
? {
? ? printf("%d\t", matrix[i]);
? }
? return 0;
}
ruben-at-www:~> gcc asia.c
ruben-at-www:~> ./a.out
1? ? ? ? 2? ? ? ? 3? ? ? ? 4
2? ? ? ? 3? ? ? ? 4? ? ? ? -1076361972? ? ? ruben-at-www:~>
What happened here?
_______________________________________________
hangout mailing list
[3]hangout-at-nylxs.com
[4]http://www.nylxs.com/
References
1. mailto:as9795-at-nyu.edu
2. mailto:mrbrklyn-at-panix.com
3. mailto:hangout-at-nylxs.com
4. http://www.nylxs.com/
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_______________________________________________
hangout mailing list
hangout-at-nylxs.com
http://www.nylxs.com/
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