The special case of the array name of the C language __c language

To see the domestic textbooks that write:

But there are some special circumstances. First: Operands of an array as a & operator

#include <stdio.h>

int main (void)
{
    int a[] = {1,2,3};//creates an array
    int *l;//a pointer
    int (*P) that points to integers [ 3];//A pointer to an array
    l=a;//array name can only represent a pointer to an integer
//p=a;
    The p=&a;//array name address is the pointer to the arrays
    printf ("p=%p\n", p);
    printf ("l=%p\n", l);

    printf ("p+1=%p\n", p+1);
    printf ("l+1=%p\n", l+1);
    return 0;
}

In this example, the array name of a, in p=&a;, does not represent the address of the first element of the array, but represents the entire array. The second scenario: the operands of the array as the sizeof operator.

#include <stdio.h>

int main (void)
{
    int a[] = {1,2,3};//Create an array

    printf ("size=%d\n", sizeof a );


    return 0;
}

In this example, the array name A, which is the operand of the sizeof, does not represent the address of the first element of the array.