nil pointer
常见例句
- Normal control characters (characters with values less than 32): This especially includes character 0, traditionally called NUL; I call it NIL to distinguish it from C's NULL pointer.
常规控制字符(字符值小于32):还特别包括字符0,传统上称做 NUL;我把它称为 NIL 以区别于 C 语言中的 NULL 指针。 返回 nil pointer