how to find 2d array size in c++

Question

How do I find the size of a 2D array in C++? Is there any predefined function like sizeof to determine the size of the array?

Also, can anyone tell me h

Answer 1

int arr[5][4];

For the row subscript(4 raise to 2, include cmath to use pow):

sizeof(arr1)/pow(4,2)   

Column subscript:

sizeof(*arr1)/4

4 means 4 bytes, size of int.