[MinGW-notify] [ mingw-Bugs-3448694 ] qsort problem

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Bugs item #3448694, was opened at 2011-12-02 16:13
Message generated for change (Comment added) made by earnie
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Category: MinGW
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Rene de Zwart (renez52)
Assigned to: Nobody/Anonymous (nobody)
Summary: qsort problem

Initial Comment:
if I compile thsi simple program
------------------------------------------------------------------------------
#include <stdio.h>
int sortint(const void *a, const void *b){
  return *(int *) a < *(int *) b;
}
int rene[] ={ 10,1,100,3,2,99,4,999,102 };
int main(){
	int i;
	for(i =0; i <sizeof(rene)/sizeof(int);i++)
		printf("%d) %d\n",i,rene[i]);
	qsort(rene,sizeof(rene)/sizeof(int), sizeof(int), sortint);
	printf("sorted is\n\n");
	for(i =0; i <sizeof(rene)/sizeof(int);i++)
		printf("%d) %d\n",i,rene[i]);
}
------------------------------------------------------------------------------------------------

i get
0) 10
1) 1
2) 100
3) 3
4) 2
5) 99
6) 4
7) 999
8) 102
sorted is

0) 102
1) 999
2) 100
3) 99
4) 10
5) 4
6) 3
7) 2
8) 1

which is obvious wrong. Compiling the same program under linux gives
0) 10
1) 1
2) 100
3) 3
4) 2
5) 99
6) 4
7) 999
8) 102
sorted is

0) 999
1) 102
2) 100
3) 99
4) 10
5) 4
6) 3
7) 2
8) 1

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>Comment By: Earnie Boyd (earnie)
Date: 2011-12-03 09:33

Message:
I do too, I even corrected your programming bug* and still do not get the
expected result.  However, there is nothing we (MinGW) can do about the
issue since MicroSoft is its producer**.  I found an example*** which works
with your array but I cannot get your program to work.

*) You need to #include <stdlib.h>
**) http://msdn.microsoft.com/en-us/library/zes7xw0h.aspx
***) http://www.cpp-tips.net/QSort

----------------------------------------------------------------------

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