[定义和使用](%E6%8C%87%E9%92%88de%E5%AE%9A%E4%B9%89%E5%92%8C%E4%BD%BF%E7%94%A8.md) [空指针](%E7%A9%BA%E6%8C%87%E9%92%88.md) [野指针](%E9%87%8E%E6%8C%87%E9%92%88.md) [new](new.md) [函数参数](%E6%8C%87%E9%92%88%E5%87%BD%E6%95%B0%E5%8F%82%E6%95%B0.md)