Objective-C is a strict superset of C, so everything that is valid C is also valid Objective-C. Objective-C just adds a thin object-oriented layer on top of C (in fact, the Objective-C runtime itself is implemented in pure C).——引自 stackoverflow
大体意思就是说:ObjC是C的一个严格的“超集”,所以所有在C中有效的在ObjC中同样有效(这其实就是超级的解释),另外ObjC只是在C的基础上增加了面向对象这一特性(注意与C++区别) |