array of pointers - array of pointers

array of pointers - array of pointers

I don't understand this question at all as an undergraduate. Recently, I took the time to figure it out.

simple explanation

Pointer array array of points The array is full of pointers

就像二维数组里面  每个二维数组的一维向量 其实都是一个指针 指向了其中的值

a pointer to an array a pointer to an array

code logic

Each element in a is the address of each element in arry
b is a pointer to the arry array, which stores the address of arry, which is the address of the first bit of arry

using namespace std;
int main() {
    
    
    int arry[4] = {
    
    1,2,3};
    int* a[4];  //array of pointer;
    int(*b)[4]; //a pointer to an array 
    b = &arry;

    for (int i = 0; i < 4; ++i) {
    
    
         a[i] = &(arry[i]);
    }
    cout << *(a[0])<<endl;
    cout << (*b)[0]<<endl;
    cout << (*b)[2]<<endl;
    return 0;
}

operation result

think

If this is the case, the array pointer can be regarded as a two-dimensional array,
what about the pointer array? What is the use of int(*b)[4] to represent an array that can point to 4 different arrays of memory blocks