/*

Run at CSE like this

$ clang -Wno-everything invalid1.c
$ ./invalid1
i is at address 0x7fffb1d7bce8
a[0] is at address 0x7fffb1d7bcc0
a[9] is at address 0x7fffb1d7bce4
a[10] would be stored at address 0x7fffb1d7bce8

doesn't terminate

If compiling with gcc, change index to 11.

*/

#include <stdio.h>
#include <stdlib.h>

int main(void) {
    int i;
    int a[10];
    printf("i is at address %p\n", &i);
    printf("a[0] is at address %p\n", &a[0]);
    printf("a[9] is at address %p\n", &a[9]);
    printf("a[10] would be stored at address %p\n", &a[10]);

    // loop writes to a[10] which don't exist -
    // but on CSE servers  (clang 7.0 x86_64/Linux)
    // i would be stored where a[10] is stored

    for (i = 0; i <= 10; i++) {
        printf("%d\n", i);
        a[i] = 0;
    }

    return 0;
}