#include <stdio.h> 
#include <stdlib.h>
#include <GL/glut.h>
#include <GL/gl.h>





int main(int argc, char** argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
    glutInitWindowSize (250, 250); 
    glutInitWindowPosition (100, 100);
    glutCreateWindow ("hello");
    init ();
    glutDisplayFunc(display); 
    glutMainLoop();
    return 0;   /* ISO C requires main to return int. */
}




















main() {

//   InitializeAWindowPlease();

       glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH );

        // Create and position the graphics window
    glutInitWindowPosition( 0, 0 );
    glutInitWindowSize( 800, 600 );
    glutCreateWindow( "opengl test" );


   glClearColor (0.0, 0.0, 0.0, 0.0);
   glClear (GL_COLOR_BUFFER_BIT);
   glColor3f (1.0, 1.0, 1.0);
   glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
   glBegin(GL_POLYGON);
      glVertex3f (0.25, 0.25, 0.0);
      glVertex3f (0.75, 0.25, 0.0);
      glVertex3f (0.75, 0.75, 0.0);
      glVertex3f (0.25, 0.75, 0.0);
   glEnd();
   glFlush();

//   UpdateTheWindowAndCheckForEvents();
}