How to draw a pipe?

Hello,
I have question how can I draw pipe in opengl? I am using C++ and glut, I found something like this but i dont understand the code:

Code :

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	int ACC=48;
    float a,p,q;
    int i;
 
    glBegin(GL_QUAD_STRIP);
    for (i=0;i<=ACC;i++)
    {
	a = i*PI*2/ACC;
	p = cos(a);
	q = sin(a);
	glNormal3f(p, q, 0.4);
	glVertex3f(0.7*p, 0.7*q, 0.8);
	glNormal3f(0.0, 0.0, 1.0);
	glVertex3f(0.7*p, 0.7*q, 10);
    }
    glEnd();

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Generaly I want to draw a spring but not with gl_Line_Stripe becouse i must to put material on it:(