import stdio
import t, c


def deref_test() -> int:
    s: str = "hello"
    sp: str = s
    slen: int = 0
    while c.Deref(sp) != 0:
        slen = slen + 1
        sp = sp + 1
    stdio.printf("ptr: len(hello)=%d\n", slen)
    return 0