Что это за исключение и как его удалить? Я продолжаю получать его в glutmainloop

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привет , у меня есть код для проекта openGL, но я получаю это исключение "

Цитата:

Нарушение прав доступа написание расположение 0x000000D4.

вот этот код

#include<stdio.h>
#include<conio.h>
#include<process.h>
#include<stdlib.h>
#include <Windows.h>
#include <GL\glew.h>
#include <GL\freeglut.h>
#include <iostream>
void renderscene()
{

	glClear(GL_COLOR_BUFFER_BIT);
	glColor3f(1.0, 0.3, 0.0);

	char c1[] = "COMPUTER GRAPHICS PROJECT";
	glRasterPos2f(600, 375);
	for (int i = 0; c1[i] != '\0'; i++)
		glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, c1[i]);

	char c2[] = "NAME:";
	glRasterPos2f(700.0, 350.0);
	for (int i = 0; c2[i] != '\0'; i++)
		glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, c2[i]);

	char c3[] = "COLLEGE:";
	glRasterPos2f(700.0, 325.0);
	for (int i = 0; c3[i] != '\0'; i++)
		glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, c3[i]);

	char c4[] = "";
	glRasterPos2f(700.0, 300.0);
	for (int i = 0; c4[i] != '\0'; i++)
		glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, c4[i]);

	char c5[] = "Press right button of mouse to get various options";
	glRasterPos2f(300.0, 200.0);
	for (int i = 0; c5[i] != '\0'; i++)
		glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, c5[i]);
	glFlush();

}


void init()
{
	glClearColor(1.0, 1.0, 1.0, 0.0);
	glColor3f(0.0f, 0.0f, 0.0f);
	glPointSize(0.8);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluOrtho2D(0.0, 2000.0, 0.0, 400.0);
}
struct node
{
	int info;
	struct node *rlink;
	struct node *llink;
};
typedef struct node *NODE;
static int count = 0;
NODE head;
int h[100];
struct arr
{
	int p;
	int q;
}m[100];

NODE getnode()
{
	NODE temp;
	temp = (NODE)malloc(sizeof(struct node));
	if (temp == NULL)
	{
		printf("out of memory\n");
		exit(1);
	}
	return temp;
}
void disp()
{
	glClear(GL_COLOR_BUFFER_BIT);
	glColor3f(1.0, 0.0, 1.0);
	char c[] = "List is Empty";
	glRasterPos2f(800.0, 200.0);
	for (int i = 0; c[i] != '\0'; i++)
		glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, c[i]);
	glColor3f(1.0, 1.0, 1.0);
	glBegin(GL_POLYGON);
	glVertex2i(100, 200);
	glVertex2i(100, 225);
	glVertex2i(500, 225);
	glVertex2i(500, 200);
	glEnd();
	glFlush();
}
NODE display(NODE head)
{
	glClear(GL_COLOR_BUFFER_BIT);
	NODE temp;
	int i = 0, k, j = 0;
	temp = head->rlink;
	if (temp == head)
	{
		printf(" list is empty\n");
		disp();
		return head;

	}
	printf("elements are\n");

	while (temp != head)
	{
		for (k = 0; k<count; k++)
		{
			GLfloat x1 = 100, x2 = 150, x3 = 350, x4 = 400, x5 = 500, x6 = 480, x7 = 20, x9 = 0;
			h[j] = temp->info;
			printf("%d\n", h[j]);
			glColor3f(0.0, 0.0, 0.0);
			char c[] = "Info";
			glRasterPos2f(220.0, 230.0);
			for (int a = 0; c[a] != '\0'; a++)
				glutBitmapCharacter(GLUT_BITMAP_HELVETICA_10, c[a]);
			glColor3f(1.0, 0.0, 0.0);
			glBegin(GL_POLYGON);
			glVertex2i(x2 + k * 400, 200);
			glVertex2i(x2 + k * 400, 225);
			glVertex2i(x3 + k * 400, 225);
			glVertex2i(x3 + k * 400, 200);
			glEnd();
			glColor3f(0.0, 0.0, 0.0);
			char r[] = "rlink";
			glRasterPos2f(355.0, 230.0);
			for (int b = 0; r[b] != '\0'; b++)
				glutBitmapCharacter(GLUT_BITMAP_HELVETICA_10, r[b]);
			glColor3f(0.0, 0.0, 1.0);
			glBegin(GL_POLYGON);
			glVertex2i(x3 + k * 400, 225);
			glVertex2i(x3 + k * 400, 200);
			glVertex2i(x4 + k * 400, 200);
			glVertex2i(x4 + k * 400, 225);
			glEnd();
			glColor3f(0.0, 0.0, 0.0);
			char s[] = "llink";
			glRasterPos2f(120.0, 230.0);
			for (int d = 0; s[d] != '\0'; d++)
				glutBitmapCharacter(GLUT_BITMAP_HELVETICA_10, s[d]);
			glColor3f(0.0, 1.0, 0.0);
			glBegin(GL_POLYGON);
			glVertex2i(x1 + k * 400, 225);
			glVertex2i(x1 + k * 400, 200);
			glVertex2i(x2 + k * 400, 200);
			glVertex2i(x2 + k * 400, 225);
			glEnd();
			glColor3f(0.0, 1.0, 0.0);
			glBegin(GL_LINES);
			glVertex2i(x1 + k * 400, 207);
			glVertex2i(x9 + k * 400, 207);
			glVertex2i(x9 + k * 400, 207);
			glVertex2i(x7 + k * 400, 202);
			glVertex2i(x9 + k * 400, 207);
			glVertex2i(x7 + k * 400, 210);
			glColor3f(0.0, 0.0, 1.0);
			glBegin(GL_LINES);
			glVertex2i(x4 + k * 400, 215);
			glVertex2i(x5 + k * 400, 215);
			glVertex2i(x5 + k * 400, 215);
			glVertex2i(x6 + k * 400, 210);
			glVertex2i(x5 + k * 400, 215);
			glVertex2i(x6 + k * 400, 219);
			glEnd();
			m[i].p = h[j] / 10;
			m[i].q = h[j] % 10;
			m[i].p = m[i].p + 48;
			m[i].q = m[i].q + 48;
			int x8 = 225;
			glColor3f(0.0, 0.0, 0.0);
			glRasterPos2i(x8 + k * 400, 210);
			glutBitmapCharacter(GLUT_BITMAP_HELVETICA_12, m[i].p);
			glutBitmapCharacter(GLUT_BITMAP_HELVETICA_12, m[i].q);
			i++;
			j++;
			temp = temp->rlink;
			glFlush();
		}
	}
	return head;
}
NODE insertfront(NODE head, int item)
{
	NODE temp, cur;
	temp = getnode();
	temp->info = item;
	cur = head->rlink;
	head->rlink = temp;
	temp->llink = head;
	temp->rlink = cur;
	cur->llink = temp;
	return head;

}
NODE insertrear(NODE head, int item)
{
	NODE temp, cur;
	temp = getnode();
	temp->info = item;
	cur = head->llink;
	head->llink = temp;
	temp->rlink = head;
	temp->llink = cur;
	cur->rlink = temp;
	return head;
}
NODE insertleft(NODE head, int ele)
{
	int item;
	NODE temp, cur, pre;
	if (head->rlink == head)
	{
		printf("list is empty\n");
		count--;
		return head;
	}
	cur = head->rlink;
	while (cur != head)
	{
		if (cur->info == ele)
			break;
		cur = cur->rlink;
	}
	if (cur == head)
	{
		printf("%d element not found\n", ele);
		count--;
		return head;
	}
	printf("enter element to be inserted\n");
	scanf_s("%d", &item);
	pre = cur->llink;
	temp = getnode();
	temp->info = item;
	temp->llink = pre;
	temp->rlink = cur;
	cur->llink = temp;
	pre->rlink = temp;
	return head;

}
NODE insertright(NODE head, int ele)
{
	int item;
	glClear(GL_COLOR_BUFFER_BIT);
	NODE temp, cur, next;
	if (head->rlink == head)
	{
		printf("list is empty\n");
		count--;
		return head;
	}
	cur = head->rlink;
	while (cur != head)
	{
		if (cur->info == ele)
		{
			printf("enter element to be inserted\n");
			scanf_s("%d", &item);
			next = cur->rlink;
			temp = getnode();
			temp->info = item;
			temp->llink = cur;
			temp->rlink = next;
			cur->rlink = temp;
			next->llink = temp;
			return head;
		}
		cur = cur->rlink;
	}
	printf("%d element not found\n", ele);
	count--;
	return head;
}
NODE deletfront(NODE head)
{
	NODE cur, next;
	if (head->rlink == head)
	{
		printf("list is empty\n");
		count++;
		return head;
	}
	cur = head->rlink;
	next = cur->rlink;
	head->rlink = next;
	next->llink = head;
	printf("node to b deleted is %d\n", cur->info);
	free(cur);
	return head;
}
NODE deletrear(NODE head)
{
	NODE cur, prev;
	if (head->llink == head)
	{
		printf("list is empty\n");
		count++;
		return head;
	}
	cur = head->llink;
	prev = cur->llink;
	head->llink = prev;
	prev->rlink = head;
	printf("node to b deleted is %d\n", cur->info);
	free(cur);
	return head;
}

NODE del(NODE head, int ele)
{
	NODE cur, next, pre;
	glClear(GL_COLOR_BUFFER_BIT);
	if (head->rlink == head)
	{
		printf("list is empty\n");
		count++;
		return head;
	}
	cur = head->rlink;
	while (cur != head)
	{
		if (cur->info == ele)
			break;
		cur = cur->rlink;
	}
	if (cur == head)
	{
		printf("%d element not found\n", ele);
		count++;
		return head;
	}
	pre = cur->llink;
	next = cur->rlink;
	printf("%d element found and deleted\n", ele);
	pre->rlink = next;
	next->llink = pre;
	free(cur);
	return head;

}


void top_menu(int option)
{
	int ele;
	switch (option)
	{
	case 1:

		printf("enter item to be inserted\n");
		scanf_s("%d", &ele);
		head = insertfront(head, ele);
		count++;
		display(head);
		break;
	case 2:
		printf("enter item to be inserted\n");
		scanf_s("%d", &ele);
		head = insertrear(head, ele);
		count++;
		display(head);
		break;
	case 3:
		printf("enter key to be searched\n");
		scanf_s("%d", &ele);
		head = insertleft(head, ele);
		count++;
		display(head);
		break;
	case 4:
		printf("enter key to be searched\n");
		scanf_s("%d", &ele);
		head = insertright(head, ele);
		count++;
		display(head);
		break;
	case 5:
		head = deletfront(head);
		count--;
		display(head);
		break;
	case 6:
		head = deletrear(head);
		count--;
		display(head);
		break;
	case  7:printf("enter key\n");
		scanf_s("%d", &ele);
		count--;
		head = del(head, ele);
		display(head);
		break;
	case 8:exit(0);
	}
}
void main(int argc, char**argv)
{
	head = getnode();
	head->rlink = head;
	head->llink = head;
	head->info = NULL;
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
	glutInitWindowSize(700, 500);
	glutInitWindowPosition(0, 0);
	glutCreateWindow("Doubly Linked List");
	glutCreateMenu(top_menu);
	glutAddMenuEntry("InsertFront", 1);
	glutAddMenuEntry("InsertRear", 2);
	glutAddMenuEntry("InsertLeft", 3);
	glutAddMenuEntry("InsertRight", 4);
	glutAddMenuEntry("DeleteFront", 5);
	glutAddMenuEntry("DeleteRear", 6);
	glutAddMenuEntry("DeletSpecified", 7);
	glutAddMenuEntry("Exit", 8);
	glutAttachMenu(GLUT_RIGHT_BUTTON);
	glutDisplayFunc(renderscene);
	init();
	glutMainLoop();		
}

Что я уже пробовал:

Я ничего не пробовал, потому что ничего не понимаю

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