Some things that are easy to be ignored in C language 3 [sharing, union, union]

The three are actually talking about one thing. Of course, the focus here is not here. 1. The address of the shared body variable is the same as that of other members. 2. You Cannot initialize or assign values to shared object variables, or reference a shared object variable name to obtain the value of a member. (Excluding non-mainstream values such as * (int *) (& UnionVar). 3. The shared body cannot be passed as a function parameter, nor can it be returned as a function. (Do not exclude the share body under the nested struct) 4. The share body seems to be used for data conversion, such as: [cpp] union {char a [8]; double x ;} xxx; xxx. x = 3; char I = 0; for (; I <8; I ++) printf ("% d \ t", xxx. a [I]);