C-Plus-Plus/internalExternal.cpp at master · rishiyadav23/C-Plus-Plus · GitHub

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#include <iostream>
using namespace std;

struct Node{
	int data;
	struct Node *left;
	struct Node *right;
};

int leafCount(struct Node *root){

	if(root == NULL)
		return 0;
	else if(root->left == NULL && root->right == NULL)
		return 1;
	else
		return leafCount(root->left) + leafCount(root->right);
}

int totalCount(struct Node *root){

	if(root == NULL)
		return 0;
	else if(root->left == NULL && root->right == NULL)
		return 1;
	else
		return 1 + totalCount(root->right) + totalCount(root->left);
};

struct Node *getNode(int data){
	struct Node *tmp = new Node();
	tmp ->data = data;
	tmp ->left = NULL;
	tmp -> right = NULL;
	return tmp;
}

int main() {

	struct Node *root = getNode(1);
	root->left = getNode(2);
	root->right = getNode(3);
	root->left->left = getNode(4);
	root->left->right = getNode(5);

	int l, t;
	l = leafCount(root);
	t = totalCount(root);
	cout<<"Number of leaf nodes :"<<l<<"\n";
	cout<<"Number of internal nodes :"<<t - l;

	return 0;
}