[Bug c++/96538] Integer overflow when there are multiple operands in addition operation.

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96538

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
There is NO BUG here:
sum = arr[1]+arr[2]+arr[3];

Is done in integer type and then casted to long.
that is it is the same as:
sum = (long)(arr[1]+arr[2]+arr[3]);

While:
for(int j=0;j<5;j++)
{
sum = sum+ arr[j];
}
Is Done in long type.

You can fix the original code by doing:
sum = ((long)arr[1])+((long)arr[2])+((long)arr[3]);