[C] 指標

&:取址(reference operator), address of ... (eq.&a:address of a)
*:取值(dereference operator),value of ... (eq.*b:value of b)


各種用法解說:
char *ptr;  //char表示point指向變數的類型,唸做:ptr is a pointer to char

char p[5]; // p is a 5-element array of char

char *p[5]; // p is a 5-element array of pointer to char 

char (*p)[5]; // p is a pointer to a 5-element array of char

另一種解釋

int *ptr[10];

This is an array of 10 int* pointers

int (*ptr)[10];

This is a pointer to an array of 10 int

typedef void (*func)(char);
func是個指標,指向某個函式,而這個涵式有一個資料型態為char的引述,回傳值為void

示意圖:

*ptr1依地址取值,所以依照ptr1內的地址0x00A1取值為20

**ptr2依地址取值,所以依照ptr2內的地址0x00A2取值為0x00A1,再依照0x00A1取值為20

指標與雙重指標差別

指標

雙重指標(a pointer to a pointer)

神奇指標用法

What's the meaning of 'char (*p)[5];'?
http://blog.nutpan.com/2016/07/run-programs-directly-from-your-blog-or.html

Difference between *ptr[10] and (*ptr)[10]