function overloading problem

        So why void func(int a); void func(const int a); is not function overloading? one

        void func(int* a); void func(int* const a); //not function overloading II

        void func(int* a); void func(const int* a); // is function overloading 3

        1. The variable a is modified by const; so these two types are the same, not function overloading;

        2. The variable a is modified by const; so these two types are the same, not function overloading;

        3. const modifies the int type, not the variable a, so the two types are different and are function overloading;

 So only three of them satisfy the function overloading condition, and two of them are overloaded functions.