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C pointer things (pointer VS array (:warning: char pointer VS array of…

- - - - Output
        2 97
        
        Explaination
        In foo(), p acts as a local variable
        => p value is changed locally
    - - Output
        2 2
        
        Explaination
        In foo(), address of p is changed
        => p points to another address after foo()
- - - - :warning:
        void f1(int);
        void f2(int, int);
        void (*foo)() = f1; //Work well
        void (*foo)() = f2; //Work well
    - - void foo(void (*abc)(int)) {
        abc(4);
        }
        
        FUNCTION foo
        
        argument: function pointer abc that with
        void (*abc)(int)
    - - int (*foo(void))(int){}
        
        FUNCTION foo
        
        void argument
        
        return a function pointer: int (*pointer)(int)