#cpp-pointer

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Double pointer

Pointer 1 lưu trữ địa chỉ của biến, pointer thứ 2 lưu trữ địa chỉ của pointer 1 - double pointer.

Cách khai báo double pointer trong C++:

int **ptr;

VD:

int var = 789;    // pointer for var    

int *ptr2;    // double pointer for ptr2    

int **ptr1;    // storing address of var in ptr2    

ptr2 = &var;        // Storing address of ptr2 in ptr1    

ptr1 = &ptr2;

Multidimensional dynamic array

VD mảng 2 chiều:

int **table = new int*[rows];

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

{

       table[i] = new int[cols];

}

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

{

      delete[] table[i];

}