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printSideways

Language/Type: C++ binary trees pointers recursion

Write a function named printSideways that accepts a pointer to the root of a binary tree of integers. Your function should print the tree in a sideways indented format, with right nodes above roots above left nodes, with each level 4 spaces more indented than the one above it. If the tree is empty/nullptr, print no output.

Constraints: You must implement your function recursively and without using loops. Do not construct any new BinaryTreeNode objects in solving this problem (though you may create as many BinaryTreeNode* pointer variables as you like). Do not use any auxiliary data structures to solve this problem (no array, vector, stack, queue, string, etc). Your function should not modify the tree's state; the state of the tree should remain constant with respect to your function.

Assume that you are using the BinaryTreeNode structure as defined below: 

struct BinaryTreeNode {
    int data;
    BinaryTreeNode* left;
    BinaryTreeNode* right;
};
Function: Write a C++ function as described, not a complete program.

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