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

void init(void){}

void display(void)
{
   glClear(GL_COLOR_BUFFER_BIT);
   glColor3f (0.0, 1.0, 0.0);
   glPushMatrix();
GLfloat vertices[] = {0.1,0.1,0.1,  -0.1,0.1,0.1,  -0.1,-0.1,0.1,  0.1,-0.1,0.1,
                     0.1,0.1,0.1,  0.1,-0.1,0.1,  0.1,-0.1,-0.1,  0.1,0.1,-0.1,
                     0.1,0.1,0.1,  0.1,0.1,-0.1,  -0.1,0.1,-0.1,  -0.1,0.1,0.1,
                     -0.1,0.1,0.1,  -0.1,0.1,-0.1,  -0.1,-0.1,-0.1,  -0.1,-0.1,0.1,
                     -0.1,-0.1,-0.1,  0.1,-0.1,-0.1,  0.1,-0.1,0.1,  -0.1,-0.1,0.1,
                     0.1,-0.1,-0.1,  -0.1,-0.1,-0.1,  -0.1,0.1,-0.1,  0.1,0.1,-0.1};
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(3, GL_FLOAT, 0, vertices);
glDrawArrays(GL_QUADS, 0, 24);
glDisableClientState(GL_VERTEX_ARRAY);
glPopMatrix();glFlush();

}

void keyboard(unsigned char key, int x, int y)
{
   switch (key) {
      case 'z':
	glRotatef(5, 0, 0.0, 0.1);

         glutPostRedisplay();
         break;
     case 'y':
        glRotatef(5,0,0.1,0);
        glutPostRedisplay();
        break;
     case 'x':
      glRotatef(5,0.1,0,0);
      glutPostRedisplay();
      break;
      case 27:
         exit(0);
    }
}

int main(int argc, char** argv)
{
   glutInit(&argc, argv);
   glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
   glutInitWindowSize (400, 400);
   glutCreateWindow (argv[0]);   init();
   glutKeyboardFunc (keyboard);
   glutDisplayFunc (display);
   glutMainLoop();
   return 0;
}