A function with the return value type of integer pointer (int*) is defined, and the function name is A. This function needs to pass a parameter b, and the type of this parameter is also integer pointer (int*).

So where this function is called, an integer pointer should be passed in.

Three points of pointer are emphasized here: ① pointer is a special variable; (2) The value stored in the variable pointer is the memory address; ③ This type of number starts with the value of pointer variable as the memory address and is stored in several bytes.