Write a program in C++ that stores the following elements in a two dimensional array and prints out the product of all the diagonal elements of the array. Use Nested For Loops to traverse the array to calculate the product. The elements of the array are as follows :

12 22 34 45

33 1 2 5

4 98 21 13

3 21 45 11

You should display the product of the following elements: 12 x 1 x 21 x 11 x 3 x 98 x 2 x 45