C language practice to solve the known pointer P pointing to the figure, and then execute * p++；+; The value of post *p is

*p++, first of all, you should know that * and++have the same priority and are combined from right to left.

It is equivalent to *(p++), but p++ means to use it first and then add it. So first use, that is, the operation of *p, and then add, that is, perform p++.

So *p++ is equivalent to: {* p；; p++

So the current value of *p is 20, and then p++ (which is the value that the pointer is not pointed to by *p) moves back to the position of a[3].

At this point, *p is 30.