To buy a good book, I prefer C++ introductory classics.

A good book can affect your life.

Int a defines an integer variable named a.

Int& defines a reference shaping variable (retransmission parameters are different from the last one).

Int *a defines a pointer to an integer variable.

Int a[] defines an array.

Char *a defines a character pointer.

Char *a[] defines an array of character pointers.

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A pointer is an address.

If you are a variable, your home address value is a pointer, haha.