test for sequence point

gistfile1.sh

yifan@yifan-laptop:~/c/playground$ cat testsequencepoint.c 
#include <stdio.h>

int a[10];
int i;

int main(int argc, char *argv[])
{
        for (i = 0; i < 5;) {
                a[i] = a[i++] + 5;
        }
        for (i = 0; i < 5; i++) {
                printf("a[%d] = %d\n", i, a[i]);
        }
        return 0;
}
yifan@yifan-laptop:~/c/playground$ gcc testsequencepoint.c 
yifan@yifan-laptop:~/c/playground$ ./a.out 
a[0] = 5
a[1] = 5
a[2] = 5
a[3] = 5
a[4] = 5
yifan@yifan-laptop:~/c/playground$ clang testsequencepoint.c 
yifan@yifan-laptop:~/c/playground$ ./a.out 
a[0] = 0
a[1] = 5
a[2] = 10
a[3] = 15
a[4] = 20
yifan@yifan-laptop:~/c/playground$