void init()

{

    //clear window and initialize background color, shading model 

    //initialize material properties, lighting, etc. 

}

void display()

{

    //display the graphics 

}

void reshape(int w, int h)

{

    //set window dimensions and viewpoint 

}

void mouse (parameters)

{

    //control statements 

}

void keyboard (parameters)

{

    //control statements

}

int main()

{

    //call the above

}