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* [Bug c/13734] New: round() gives random numbers
@ 2004-01-19 4:17 unruh at physics dot ubc dot ca
2004-01-19 4:26 ` [Bug c/13734] " pinskia at gcc dot gnu dot org
0 siblings, 1 reply; 2+ messages in thread
From: unruh at physics dot ubc dot ca @ 2004-01-19 4:17 UTC (permalink / raw)
To: gcc-bugs
The round() function outputs random numbers
#include <math.h>
main()
{
printf( "%f %f\n", round(1.0), round(1.0001));
}
Output
-2.000000 6.000000
However these values appear to be random, and can change on different
machines and at different times on the same machine.
(Mandrake 9.0 and 9.1)
gcc -o test test.c -lm
--
Summary: round() gives random numbers
Product: gcc
Version: 3.2.2
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: unruh at physics dot ubc dot ca
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13734
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c/13734] round() gives random numbers
2004-01-19 4:17 [Bug c/13734] New: round() gives random numbers unruh at physics dot ubc dot ca
@ 2004-01-19 4:26 ` pinskia at gcc dot gnu dot org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-01-19 4:26 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-01-19 04:26 -------
Use warnings:
pr13734.c:4: warning: return type defaults to `int'
pr13734.c: In function `main':
pr13734.c:5: warning: implicit declaration of function `round'
pr13734.c:5: warning: double format, different type arg (arg 2)
pr13734.c:5: warning: double format, different type arg (arg 3)
pr13734.c:6: warning: control reaches end of non-void function
See how round is implicitly declared, use -std=c99 or -std=gnu99 which turns on the c99
functions in math.h.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13734
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2004-01-19 4:17 [Bug c/13734] New: round() gives random numbers unruh at physics dot ubc dot ca
2004-01-19 4:26 ` [Bug c/13734] " pinskia at gcc dot gnu dot org
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