#include "assert.h"
#include "stdbool.h"
#include "ctype.h"
#include "stdio.h"

int main(void) {
    assert(isalnum('a') == true  & "'a' must     be alphanumeric!")
    assert(isalnum('-') == false & "'-' must not be alphanumeric!");
    void* x = &x;
    printf("%p %p\n", x = 0, 0);
}