QUICK QUESTION, ACT NOW
If I typecast a pointer to a different kind of pointer, and incrementz the pointer, will the pointer be incremented by the amount accordiing to the typecast or the real pointer?sizeof(long) (ie. 4)sizeof(char) (ie. 1)thx in advance, kindly /prog/ warriors
ah stupid bold tags
3
Name:
Anonymous
2008-05-21 16:21
Since the cast to char* is applied to the result of ++ptr, then the increment is performed before the cast, and ptr is increased by sizeof(long).char* q = (char*)ptr;
4
Name:
Anonymous
2008-05-21 16:24
5
Name:
Anonymous
2008-05-21 16:27
>>3
ok.. but I just want to increase the
long ptr by a
char 's size, rather than the expected 4 bytes
(ps. lol @ actually getting help on /prog/ )
6
Name:
Anonymous
2008-05-21 16:30
DON'T HELP HIM.
7
Name:
Anonymous
2008-05-21 16:31
>>5
Forget it, it's NP-complete.
8
Name:
Anonymous
2008-05-21 17:41
WHAT IS A CHAR* AND HOW IS IT DIFFERENT FROM CHAR
9
Name:
Anonymous
2008-05-21 17:45
>>1
long * ptr;
Bad.
(char *) ++ptr;
Good.
(++ ptr (* char))
Better.
10
Name:
Anonymous
2008-05-21 18:01
>>9
What?
Just tell me how to increase the pointer by only 1 byte instead of 4
11
Name:
Anonymous 2008-05-21 18:15
>>10
You can't be serious.
12
Name:
Anonymous
2008-05-21 18:29
>>10
Why? So that you can generate CPU exceptions via unaligned data access?
13
Name:
Anonymous
2008-05-21 19:00
>>12
Yes. OK NOW TELL ME GO
14
Name:
Anonymous 2008-05-21 20:06
>>13
Unless you are severely retarded, what you're asking is simple enough that you can figure out by yourself.
15
Name:
Anonymous
2008-05-21 23:39
++(char *)ptr
16
Name:
Anonymous
2008-05-21 23:51
Oh well, at least now that
>>15 gave him the answer
1 he might go away.
17
Name:
Anonymous
2008-05-22 4:00
>>15
[Warning] use of cast expressions as lvalues is deprecated.
18
Name:
Anonymous
2008-05-22 4:34
19
Name:
Anonymous
2008-05-22 4:40
>>18
That's what it told me :[
But it did work so thx to whomever posted it... I just want to be able to do it without the annoying
[Warning] .
20
Name:
Anonymous
2008-05-22 4:49
21
Name:
Anonymous
2008-05-22 5:55
a pointer points
22
Name:
Anonymous 2008-05-22 6:32
>>17,19
ptr = (long *)((char *)ptr + 1);
but you should
not do this.
23
Name:
Anonymous
2008-05-22 6:40
24
Name:
Anonymous
2008-05-22 6:42
25
Name:
Anonymous
2008-05-22 6:53
>>23
instead of this:
ptr = (long *)((char *)ptr + 1);
you should do this:
long val = ptr[0] << CHAR_BIT | ptr[1] >> (sizeof(long) - 1) * CHAR_BIT;
26
Name:
Anonymous 2008-05-22 6:53
>>23
Alignment issues you damn retard.
>>25
No, he shouldn't.
Oh right. Well tHANKS FOR HELPING ME GUISE, I AM NOW ON MY WAY TO BECOMING AN EXPERT PROGRAMMER
28
Name:
Anonymous
2008-05-22 7:05
Why don't you just fucking do it and printf the result?
29
Name:
Anonymous
2008-05-22 7:09
>>27
I don't believe we helped you to guise at all. What are you talking about?
30
Name:
Anonymous
2008-05-22 8:47
>>26
No, he shouldn't.
why not? endianness issues are much better than alignment issues!
31
Name:
Anonymous
2008-05-22 8:51
>>26,30
He should use Haskell. It all depends on situation.
32
Name:
Anonymous
2008-05-22 9:28
C is the only language anybody really needs these days.
33
Name:
Anonymous
2008-05-22 9:40
>>32
Sure, if you're a millionare.
34
Name:
Anonymous
2008-05-22 11:48
>>30
Big endian, middle endian and the DeathStation 9000 can go fuck themselves. They´re like starting an array at 1, ½ and π respectivily.
35
Name:
Anonymous 2008-05-22 12:23
lol @ middle-endian
36
Name:
Anonymous
2008-05-22 13:59
wuts an edian?
37
Name:
Anonymous
2008-05-22 14:10
>>36
It's a term describing what side of the egg you eat first: the big end or the little end.
38
Name:
Anonymous
2008-05-22 14:36
>>37
Clever. Now I can finally remember big, middle and small endian.
39
Name:
Anonymous
2008-05-22 15:05
>>38
Bonus points if you know where it comes from, though. No wikipediaing!
40
Name:
Anonymous
2008-05-22 15:19
>>37
u not telling truth i no its sumthing with computa
41
Name:
Anonymous
2008-05-22 15:21
>>40
The term was around long before the invention of computers, you ignorant fuck.
42
Name:
HAX MY ANUS MEME FAN
2008-05-22 16:31
in b4 GulliverBelieve it or not gentlemen, it is entirely possible to be a well-read man and still appreciate the fine humor of the ``HAX MY ANUS" meme.
43
Name:
Anonymous
2008-05-22 16:36
>>41
i m confoused so it s reely wut u said?
44
Name:
Anonymous
2008-05-22 16:53
>>42
Gulliver from Gulliver's travels? I'm familiar with this story.
45
Name:
Anonymous 2008-05-22 17:21
46
Name:
Anonymous 2008-05-22 18:08
47
Name:
Anonymous
2008-05-22 18:55
>>46
son of a black person
48
Name:
Anonymous
2008-05-22 19:02
typecast my anus
49
Name:
Anonymous
2009-03-06 11:13
50
Name:
Anonymous 2010-11-26 19:08