There is nothing wrong with B. The * pb = * pa in A is not. pa is a pointer. If you take a value, how do you assign it to a pointer variable? int & in c； PC = c； No, pc is an integer reference and should be initialized as an integer variable, so it should be int &；; pc = c[0...9]; Or int * PC = c；; D, * v =&, and so on; u；