執(zhí)行如下代碼,輸出結(jié)果分別為()
A.17,20 B.17,21 C.18,20 D.18,21
執(zhí)行如下代碼,輸出結(jié)果為()
A.int(3) B.NULL C.提示未定義變量錯(cuò)誤 D.都不對(duì)