http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51952
Bug #: 51952
Summary: Wish: -Wextra should warn on result of integer
division being assigned to a float
Classification: Unclassified
Product: gcc
Version: 4.5.4
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: c
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: g...@richardneill.org
I have several times mistakenly written code like the following:
int a = 1; int b = 2; float c;
c = a/b;
when I obviously meant:
c = (float)a/b;
What the language means by "c = a/b" is "do the integer division of a/b, then
cast to float and assign to c". But what one might expect this to do is "c is
a float, which is calculated by dividing a and b".
Of course this is my fault, but it's rather a trap for the unwary. Therefore my
wish is that -Wextra should warn if there is an integer division on the RHS of
'=', and a float on the LHS.
At the moment, compiling the statement "c = a/b" triggers no errors, even when
using -Wall -Wextra.
Thanks for your consideration.
