Write the defn of the function, nodecount, that returns the number of nodes in the binary tree. Add this function to the class binary tree type and create a program to test this function. Write the defn of the function leavescount, that takes as a parameter a pointer to the root node of a binary tree and returns the number of leaves in a binary tree. Add this function to the class binary tree type and create a program to test this function. Write a function, Swapsubtrees, that swaps all of the left and right subtrees of a binary tree type and create a program to test the function