C Study notes-pointers

Pointers and Arrays

    intA[] = {1,2,3,4,5}; int*p; P=A; printf ("*a =%d\n",*a); printf ("*p =%d\n",*p); printf ("a[1] =%d\n", a[1]); printf ("p[1] =%d\n"-P:1]);

The array name is the first address of the array. The above output is the same. The array name is basically equivalent to the pointer. But a is a constant, can not do a++ or a+=1, and the pointer P can be.

pointer arrays and Arrays pointers

Data type * variable name []// First it is an array, the element of the array is a pointer, which means that each element stores the contents of an address int *a[5];    Data type (* variable name) []// First it is a pointer to an array int (*a) [5];

pointer functions and function pointers

Type identifier * function name (parameter table)// pointer function, which is a function, the return value is a pointer int *f (x, y); type identifier (* function name) ( Parameter table)// function pointer int (*f) (int  x); // The function address is assigned to the function pointer f = &= function // Use function pointer to call functions x = (*f) ();   // = f (  );

Pointer calculation

Self-increment: increase or decrease by the length of the data type it refers to

    int Ten ;     int *p;     = &A;    printf ("%p\n", p);    P+ +;    printf ("%p\n", p);

Operation Result:

0X7FFF5FBFF7FC 0x7fff5fbff800

You can see two results with a difference of 4, which is the byte length of int.

C Study notes-pointers