C / C++ / MFC

<br />
void insert(node *&root, double x, double y, double xmax, double ymax, double xmin, double ymin, int j )<br />
{<br />
	//check if root empty<br />
	if (root == NULL)<br />
	{<br />
		root = new node ( x, y, xmax/2, ymax/2, xmin/2, ymin/2 );<br />
		return;<br />
	}<br />
	//1st nw<br />
	else if ( x < 0 && y > 0 && root->xmax == 1024 && root->xmin == -1024 && root->nwnode == NULL)<br />
	{<br />
		root->nwnode = new node ( x, y, 1024, 1024, 0, 0 );<br />
	}<br />
	//1st ne<br />
	else if ( x > 0 && y > 0 && root->xmax == 1024 && root->xmin == -1024 && root->nenode == NULL)<br />
	{<br />
		root->nenode = new node ( x, y, 1024, 1024, 0, 0 );<br />
	}<br />
	//1st sw<br />
	else if ( x < 0 && y < 0 && root->xmax == 1024 && root->xmin == -1024 && root->swnode == NULL)<br />
	{<br />
		root->swnode = new node ( x, y, 1024, 1024, 0, 0 );<br />
	}<br />
	//1st se<br />
	else if ( x > 0 && y < 0 && root->xmax == 1024 && root->xmin == -1024 && root->senode == NULL)<br />
	{<br />
		root->senode = new node ( x, y, 1024, 1024, 0, 0 );<br />
	}<br />
	//orig start in NE<br />
	else if ( x >= 0 && y >= 0)<br />
	{<br />
		if ( root->xmax/2 <= x )<br />
		{<br />
			//ne<br />
			if ( root->ymax/2 <= y )<br />
			{<br />
<br />
				insert( root->nenode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
			//se<br />
			else<br />
			{<br />
				insert( root->senode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
		}<br />
		else<br />
		{<br />
			//nw<br />
			if ( root->ymax/2 <= y )<br />
			{<br />
				insert( root->nwnode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
			//sw<br />
			else<br />
			{<br />
				insert( root->swnode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
		}<br />
	}<br />
	//orig start in SE<br />
	else if ( x >= 0 && y <= 0 )<br />
	{<br />
		if ( root->xmax/2 <= x )<br />
		{<br />
			//ne<br />
			if ( root->ymin/2 <= y )<br />
			{<br />
				insert( root->nenode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
			//se<br />
			else<br />
			{<br />
				insert( root->senode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);		<br />
			}<br />
		}<br />
		else <br />
		{<br />
			//nw<br />
			if ( root->ymin/2 <= y )<br />
			{<br />
				insert( root->nwnode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
			//sw<br />
			else<br />
			{<br />
				insert( root->swnode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
		}<br />
	}<br />
	//orig start in NW<br />
	else if ( x <= 0 && y >= 0 )<br />
	{<br />
		if ( root->xmin/2 <= x )<br />
		{<br />
			//ne<br />
			if ( root->ymax/2 <= y )<br />
			{<br />
				insert( root->nenode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
			//se<br />
			else<br />
			{<br />
				insert( root->senode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
		}<br />
		else<br />
		{<br />
			//nw<br />
			if ( root->ymax/2 <= y )<br />
			{<br />
				insert( root->nwnode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
			//sw<br />
			else<br />
			{<br />
				insert( root->swnode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
		}<br />
	}<br />
	//orig start in NW<br />
	else if ( x <= 0 && y <= 0 )<br />
	{<br />
		if ( root->xmin/2 <= x )<br />
		{<br />
			//ne<br />
			if ( root->ymin/2 <= y )<br />
			{<br />
				insert( root->nenode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
			//se<br />
			else<br />
			{<br />
				insert( root->senode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
		}<br />
		else<br />
		{<br />
			//nw<br />
			if ( root->ymin/2 >= y )<br />
			{<br />
				insert( root->nwnode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
			//sw<br />
			else<br />
			{<br />
				insert( root->swnode, x, y, root->xmax, root->ymax, root->xmin, root->ymin, j);<br />
			}<br />
		}<br />
	}<br />
<br />
}<br />

<br />
extern "C" __declspec(dllexport) void DisplayMessage()<br />
{ <br />
    std::cout << "hello World from unmanaged environment";<br />
}<br />

<br />
using System.Runtime.InteroServices;<br />
<br />
<br />
//in the class declaration<br />
public class MainClass<br />
{<br />
     [DLLImport("mydll.dll")] // in the same directory of the current application<br />
public static extern void DisplayMessage();<br />
<br />
static void Main()<br />
{<br />
   DisplayMessage(); // the message string written to the console window successfully.<br />
}<br />
}<br />

<br />
class GradeBook<br />
{<br />
void DisplayMessage()<br />
{<br />
   std::cout <<"hello world from unmanaged resources";<br />
}<br />
};<br />
<br />
<br />
//and inside that dll export functions that will be called from C#<br />
<br />
extern "C" __declspec(dllexport) void ExternalMessage()<br />
{<br />
   GradeBook currentGrade;<br />
    currentGrade.DisplayMessage();<br />
}<br />

<br />
using System.RunTime.InteroServices;<br />
<br />
<br />
<br />
<br />
<br />
//dll importing attribute<br />
[DllImport("mydll.dll")]<br />
public static extern void ExternalMessage();<br />
<br />
<br />
<br />
<br />
//and in the main method<br />
static void Main(string[] args)<br />
{<br />
    ExternalMessage();<br />
}<br />