Given pointer to the root node of a binary tree of integers, write a function to print elements of the tree in its pre-order traversal.Input
You need to write a function named "Preorder" that will take root of a binary tree of integers as argument. you need to output using cout, and one element per line. you can assume that the header
iostream is already imported.
Your function should print all the elements in the binary tree in its pre-order traversal.