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* [Bug c/59755] New: BUG Increment Operator with Accessing Arrays
@ 2014-01-10 11:35 octo.nebula at gmail dot com
2014-01-10 11:38 ` [Bug c/59755] " octo.nebula at gmail dot com
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: octo.nebula at gmail dot com @ 2014-01-10 11:35 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59755
Bug ID: 59755
Summary: BUG Increment Operator with Accessing Arrays
Product: gcc
Version: 4.8.2
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: octo.nebula at gmail dot com
Guys,
The increment operator is not working right. The post ++ should increment value
of the index after the array expression. But in this case, it acts like the pre
++ version.
See code below:
#include <stdio.h>
int main()
{
int A[2][2] = { { 5, 7}, {9, 10} };
int m = 0, B[] = { 0, 0 };
int C = 0, D = 0;
C = A[m][B[m]];
D = A[m][B[m++]];
if (C != D) {
fprintf (stderr, "Error: C /= D\n");
return 1;
}
return 0;
}
[sunny@localhost trash]$ gcc test.c
[sunny@localhost trash]$ ./a.out
Error: C /= D
[sunny@localhost trash]$
GCC version is 4.8.2
^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug c/59755] BUG Increment Operator with Accessing Arrays 2014-01-10 11:35 [Bug c/59755] New: BUG Increment Operator with Accessing Arrays octo.nebula at gmail dot com @ 2014-01-10 11:38 ` octo.nebula at gmail dot com 2014-01-10 13:15 ` octo.nebula at gmail dot com ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: octo.nebula at gmail dot com @ 2014-01-10 11:38 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59755 Arjun <octo.nebula at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |octo.nebula at gmail dot com --- Comment #1 from Arjun <octo.nebula at gmail dot com> --- In the example given above, C = 5 which is A[0][0] and D = 9 which is A[1][0]. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c/59755] BUG Increment Operator with Accessing Arrays 2014-01-10 11:35 [Bug c/59755] New: BUG Increment Operator with Accessing Arrays octo.nebula at gmail dot com 2014-01-10 11:38 ` [Bug c/59755] " octo.nebula at gmail dot com @ 2014-01-10 13:15 ` octo.nebula at gmail dot com 2014-01-10 13:24 ` trippels at gcc dot gnu.org 2014-01-10 13:26 ` mpolacek at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: octo.nebula at gmail dot com @ 2014-01-10 13:15 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59755 Arjun <octo.nebula at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|INVALID |WONTFIX --- Comment #3 from Arjun <octo.nebula at gmail dot com> --- Why is that so? Shouldn't the value of m increment after the array indexing? Could you please explain? ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c/59755] BUG Increment Operator with Accessing Arrays 2014-01-10 11:35 [Bug c/59755] New: BUG Increment Operator with Accessing Arrays octo.nebula at gmail dot com 2014-01-10 11:38 ` [Bug c/59755] " octo.nebula at gmail dot com 2014-01-10 13:15 ` octo.nebula at gmail dot com @ 2014-01-10 13:24 ` trippels at gcc dot gnu.org 2014-01-10 13:26 ` mpolacek at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: trippels at gcc dot gnu.org @ 2014-01-10 13:24 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59755 --- Comment #4 from Markus Trippelsdorf <trippels at gcc dot gnu.org> --- Please read the section on -Wsequence-point: http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c/59755] BUG Increment Operator with Accessing Arrays 2014-01-10 11:35 [Bug c/59755] New: BUG Increment Operator with Accessing Arrays octo.nebula at gmail dot com ` (2 preceding siblings ...) 2014-01-10 13:24 ` trippels at gcc dot gnu.org @ 2014-01-10 13:26 ` mpolacek at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: mpolacek at gcc dot gnu.org @ 2014-01-10 13:26 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59755 Marek Polacek <mpolacek at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |mpolacek at gcc dot gnu.org Resolution|WONTFIX |INVALID ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2014-01-10 13:26 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2014-01-10 11:35 [Bug c/59755] New: BUG Increment Operator with Accessing Arrays octo.nebula at gmail dot com 2014-01-10 11:38 ` [Bug c/59755] " octo.nebula at gmail dot com 2014-01-10 13:15 ` octo.nebula at gmail dot com 2014-01-10 13:24 ` trippels at gcc dot gnu.org 2014-01-10 13:26 ` mpolacek at gcc dot gnu.org
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