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

int main(int argc, char *argv[])
{
    if (argc == 1) {
        printf("Usage: %s [pointer|array]\n", argv[0]);
        exit(EXIT_FAILURE);
    }

    if (strcmp(argv[1], "pointer") == 0) {
        char *s = "hello";
        s[0] = 'j'; /* This will cause a segfault */
        printf("%s\n", s);
    }
    else if (strcmp(argv[1], "array") == 0) {
        char s[] = "hello";
        s[0] = 'j';
        printf("%s\n", s);
    }

    exit(EXIT_SUCCESS);
}