15-Dark Horse programmer------C Language Learning notes---arrays and pointers

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Four arrays and pointers

01 The array name represents the first address of the array in memory, which represents the address information, so the array name can be interpreted as a pointer, but the array name is a constant and cannot be changed.

#include <stdio.h>intMain () {Charname[]="haha"; Charname1[]="GGGG"; Charname3[2][Ten] = {"fffff","JJJJJ"}; printf ("%s\n", name3[0]); return 0;}

02 Pointers to arrays: Defining a pointer to an array is the assignment of the first address of the array to the pointer variable.

such as: int a[10];

int *p; p=&a[0];

P=&a[0] equivalent to P=a

#include <stdio.h>intMain () {Charname[]="haha"; Charname1[]="GGGG"; Charname3[2][Ten] = {"fffff","JJJJJ"}; printf ("%s\n", name3[0]); return 0;}

03 referencing an array element by pointer: P+i represents the address of a[i], * (P+i) represents the array element A[i]

04 You can change the value of a pointer variable, but the pointer constant cannot be changed. Pointer operators have the highest precedence

05 Multi-dimensional arrays and pointers:

X[i] equivalent to * (X+i)

&x[i] equivalent to X+i

/*1. How array elements are accessed int ages[5]; int *p; p = ages; 1> array name [subscript] ages[i] 2> pointer variable name [subscript] p[i] 3> * (P + i) 2. Pointer variable +1, address value exactly Add how much, depending on the type of pointer int * 4 char * 1 double * 8*/#include<stdio.h>voidChangint*array);intMain () {intAges[] = {Ten,5, -, the, $};        Chang (ages); return 0; }voidChangint*Array) {printf ("%d\n", array[2]); }

06 pointer variables pointing to multidimensional array elements:

Pointer variables that point to a one-dimensional array consisting of M elements are defined as: type name (* pointer variable name) [length]; such as: Int (*PA) [4];

07 Strings and Pointers:

When accessing characters in a string, you can define a pointer variable, point to the first character in the string, and then use the pointer's movement to access the characters in the string

15-Dark Horse programmer------C Language Learning notes---arrays and pointers