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User-Agent: Mozilla/4.75 [en] (X11; U; Linux 2.2.16-22 i686)


A simple purely integer computation yields
the wrong answer.

Reproducible: Always
Steps to Reproduce:
1. Compile the following sample program (no special options,
   no optimization, just gcc program.c)
 
main()
{
int vec[6],sum;
vec[0]=24;
vec[1]=18;
vec[2]=12;
vec[3]=6;
vec[4]=0;
vec[5]=-24;
printf("%d %d %d %d %d %d\n",vec[0],vec[1],vec[2],vec[3],vec[4],vec[5]);
sum=( -3 * vec[0] -3 * vec[1] -3 * vec[2] -3 * vec[3] -3 * vec[4]+ 3 *
vec[5])/12;
  printf("%d\n",sum);
}

2. run it


	

Actual Results:  The result of the computation, printed on the last line,
is -20

Expected Results:  The correct answer is -21. 

This is the output I obtained
[t58@lion t58]$ gcc CBUG2.c
[t58@lion t58]$ a.out
24 18 12 6 0 -24
-20                                                                             

Using kgcc yields this correct result
[t58@lion t58]$ kgcc CBUG2.c
[t58@lion t58]$ a.out
24 18 12 6 0 -24
-21