Array pointers and array of pointers

Array pointers (also known as row pointers)

Definition: Int (*p) [n];

Note: () high priority, first of all, that P is a pointer to an integer one-dimensional array, the length of the one-dimensional array is n, it can be said that the step of P. In other words, when p+1 is executed, p spans n integer data lengths.

To illustrate:

int a[3][4];

int (*p) [4];

p=a;//assigns the first address of a two-dimensional array to p, i.e. a[0] or &a[0][0]

p++;//The statement executes, P=p+1;p crosses a[0][] and points to a[1][]

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

Array of pointers

Definition: int *p[n];

Note: [] high priority, first combined with p to form an array, and then by int* that this is an array of pointers, it is an array element with n pointer types. When P+1 is executed, p points to the next array element, and the assignment of p=a is wrong, because P is not represented, only p[0],p[1],...., P[n], and they are the address where the pointer variable can be used to hold the variable. But this means that *p=a,*p represents the value of the first element of the pointer array, the first address of a.

To illustrate:

int *p[3];

int a[3][4];

for (int i=0;i<3;i++)

P[i]=a[i];//int *p[3] Indicates that a one-dimensional array holds three pointer variables, respectively p[0],p[1],p[2], so assign values separately.

The difference between an array pointer and an array of pointers

An array pointer is just a pointer variable, similar to a two-dimensional array that occupies the storage space of a pointer in memory.

The pointer array is an array that contains multiple pointer variables that exist within the form of an array, occupying multiple pointer storage spaces.

Http://www.cnblogs.com/hongcha717/archive/2010/10/24/1859780.html

Array pointers and array of pointers