(api)jayson@Jaysons-iMac ~ Python 2.7.3 Django 1.3.4
$ cat a.c
#include <stdio.h>

int main() {
    int i = 5;
    i = ++i + ++i;
    printf("%d\n", i);
}
(api)jayson@Jaysons-iMac ~ Python 2.7.3 Django 1.3.4
$ gcc a.c
(api)jayson@Jaysons-iMac ~ Python 2.7.3 Django 1.3.4
$ ./a.out
14
(api)jayson@Jaysons-iMac ~ Python 2.7.3 Django 1.3.4
$ clang a.c
(api)jayson@Jaysons-iMac ~ Python 2.7.3 Django 1.3.4
$ ./a.out
13