#include <iostream>

main() {
InitializeAWindowPlease();
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();
}

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note: its a openGL code to make 2 squares. thanks!

Because everything about it is wrong.

OneSadCookie: Xcode/GLUT Tutorial

thanks and sorry.
i will read all the tutorial.
answer fast thanks again