A Sample OpenGL/GLUT program

This is a very simple OpenGL/GLUT program that I want you to compile and
run. This is to test whether you have a complete OpenGL/GLUT installed
on your favor computer system.

////////////////////////////////////////////////////////
//
// This should be your first OpenGL/Glut program
// do nothing but draw a yellow rectangular polygon at the
// center of the window
//
////////////////////////////////////////////////////////

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

void display()
{

glClear(GL_COLOR_BUFFER_BIT);
glColor4f(1,1,0,1);

glBegin(GL_POLYGON);
    glVertex2f(-0.5, -0.5);
    glVertex2f(-0.5, 0.5);
    glVertex2f(0.5, 0.5);
    glVertex2f(0.5, -0.5);
glEnd();
glFlush();

}

int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutCreateWindow("simple");
glutDisplayFunc(display);
glutMainLoop();
}

Here is the image that you should get on your screen:

If you get this - congratulations!! A nice first step.