undefinedadj.未定义的；不明确的undefined element[计] 无定义元素undefined swelling无名肿毒, 虚疡undefined behavior未定义状态undefined function未定义函数undefined variable未定义变量undefined location未定义单元undefined structure非稳定结构,无定型结构,无定形结构undefined algorithm自定义密码算法undefined carbuncle无名疮undefined character未定义字符