The difference between an array name and a group name address, a pointer array, and a set of pointers

firstly, We first analyze the difference between the array name and the address of the group Name.

We all know that the array name is the first address of the array, but what is the address of the group name? Look at the next procedure and you'll Understand.

#include "stdafx.h"
#include <stdio.h>
Using namespace std;
void Main ()
{
int a[5];
printf ("%d\n", a);
printf ("%d\n", &a);
printf ("%d\n", A + 1);
printf ("%d\n", &a + 1);
printf ("%d\n", &a[0] + 1);
printf ("next determine the byte size of array A and &a \ n");
printf ("%d\n", sizeof (a));
printf ("%d\n", sizeof (a));
While (1);
}

Analysis: by the running results, we know that the memory address of the array name A and &a is the same, we have known a=&a[0], so there is a+1 point to the next element in the array (that is, the first address 2751180 based on the number of bytes plus int 4).

however, instead of taking the address of constant a, &a represents the address of the ARRAY. Although the memory addresses of a and &a are the same, their meanings are different, the former represents only the first address of the array, which represents the entire array, and his input unit is the byte length of the entire array (4*5=20), so the memory address of &a+1 is 2751200. In addition, when using sizeof, because it is a keyword, not a function, the array is not automatically converted to pointers, resulting in the length of the array (4*5=20). PS: if it is (int) a+1 then the result is 27511801;

two, the difference between an array pointer and an array of Pointers.

the array pointer int (*parray) [10]=&arr; First () has a higher precedence, so Parray is a pointer to a shaped one-dimensional array with a length of 10, such as an int arr[10]={ 0,1,2,3,4,5,6,7,8,9};

To assign a two-dimensional array to a pointer, you should assign this value:
int a[3][4];
int (*p) [4]; The statement defines an array pointer to a one-dimensional array with 4 Elements.
p=a; Assign the first address of the two-dimensional array to p, i.e. a[0] or &a[0][0]
p++; After the statement executes, that is, P=p+1;p crosses line a[0][] points to the line a[1][]

So an array pointer is also called a pointer to a one-dimensional array, also known as a row pointer.

pointer array int *parray[10] [] precedence high, combined with Parray to become an array, and then by int* Description This is an integer pointer array, which has 10 pointer-type array elements,

The difference between an array name and a group name address, a pointer array, and a set of pointers