icp/oer/courses/c-advanced/sections/01-introduction/06-tree/program.c

#include <stdio.h>
#include <stdlib.h>

typedef struct node
{
	int Value;
	struct node *Left;
	struct node *Right;
}node;

node *alloc_node(int Value, node *Left, node *Right)
{
  	node *NewNode = malloc(sizeof(node));
  	NewNode->Value = Value;
  	NewNode->Left = Left;
	NewNode->Right = Right;
      
	return NewNode;
}

// inserts into the right place in the tree
void tree_insert(node *Root, int Value)
{
	// TODO: implement this
}

// finds the node with the given value.
// if it doesn't find one return null
node *tree_find(node *Root, int Value)
{
	// TODO: implement this
	return 0;
}

// deletes the node with the value while remaining sorted
// NOTE: feel free to change the function signiture
void tree_delete(node *Root, int Value)
{
	// TODO: implement this

	// NOTE: when finding the node to delete,
	// keep track of the parent node to rewire
	// the pointer when deleting

	// NOTE: don't forget to free the memory
}

// prints every member in a sorted way
int tree_print_sorted(node *Root)
{
	// TODO: implement this
}

int main(int argc, char **argv)
{
	node Root = {};
	int Numbers[10] = {9, 128, 3, 1, 42, 9001, 7, 500, 6, 10};

	// NOTE: filling the tree with numbers
	for(int i = 0 ; i < 10; i++)
	{
		tree_insert(&Root, Numbers[i]);
	}

	node *Nine = tree_find(&Root, 9);
	int FoundNine = 0;
	if(Nine)
	{
		FoundNine = 1;
		node *Left = Nine->Left;
		node *Right = Nine->Right;
		printf("Found %d with direct child %d and %d\n", Nine->Value, (Left)? Left->Value: 0, (Right)? Right->Value : 0);
	}
	tree_delete(&Root, 9);
	Nine = tree_find(&Root, 9);
	if(Nine)
	{
		printf("Failed to delete %d\n", Nine->Value);
	}
	else
	{
		if(FoundNine)
			printf("Succesfully deleted 9\n");
	}

	tree_print_sorted(&Root);
	printf("\n");
	
}