pointer arrays and arrays of pointers (handling)

Pointer array: array of pointers, which is used to store pointers to arrays, which are arrays of elements that are pointers

int* a[4] means: The elements in array A are all int pointers, and the element means: *a[i] * (a[i]) is the same, because [] precedence is higher than *

Array Pointer: A pointer to an array, which is a pointer to the array

int (*a) [4] means: A pointer to array a, which is represented by an element: (*a) [i]

1#include <iostream>2  3 using namespacestd;4  5 intMain ()6 {7     intc[4]={1,2,3,4};8 9     int*a[4];//Array of pointersTen     int(*b) [4];//Array Pointers one  ab=&c; -  -     //assigning an element in array C to array a the      for(intI=0;i<4; i++) -     { -a[i]=&c[i]; -     } +  -     //output look at the results +cout<<*a[1]<<endl;//Output 2 is the right acout<< (*b) [2]<<endl;//Output 3 is the right at      -     return 0; -}

Note: the array pointer is defined, the pointer to the first address of the array, the pointer must be given an address, it is easy to make the mistake is, do not give B address, directly with (*b) [i]=c[i] to the array b element assignment, when the array pointer does not know where to point, debugging may be correct, but the runtime must have problems, Be aware of this when using Pointers. But why does a not have to give him the address, the element of A is a pointer, in fact the for loop has already given the element in the array a address. But if you write *a[i]=c[i in the for loop], this also goes wrong.

In short, the definition of the pointer must know where the pointer points, or TRAGEDY.

pointer arrays and arrays of pointers (handling)