Variable Length Arrays in C++

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Hi, just wondering how i could control the length of an array using a variable.

e.g. i have the array -

		glBegin(GL_LINE_LOOP);
		glVertex2iv(poly[0]);
		glVertex2iv(poly[1]);
		glVertex2iv(poly[2]);
		glVertex2iv(poly[3]);
		glVertex2iv(poly[4]);
		glEnd();

obviously taking 5 points...but if i wanted the length to be as long as a variable (points) then how could this be done?

 

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cheers Jon, i've used something a little easier in myDisplay -

	for(int p( 0 ) ; p < points ; ++p)
		glVertex2iv(poly[p]);

but now i can't figure out how you get the maths behind it to relate to the code to draw out a polygon....the code being -

void myDisplay()
{
	const PI = 3.141592;
	int points, radius;
		
	glClear(GL_COLOR_BUFFER_BIT);		//Clear Screen
	glBegin(GL_POINTS);
	glPushMatrix();
	glTranslatef(x,y,0);
	//glRotate(angle, 0,0,1);
	radius = 2*PI/points;
	for(int p( 0 ) ; p < points ; ++p)
		glVertex2iv(poly[p]);

	for( int a(0);a<points;++a)
	{
		float pointAngle = angle*a ;
		glVertex2f(cos(pointAngle),sin(pointAngle));	
	}
	angle = (360.0f/points) * (PI/180);	//Converts degrees to radians
	glPopMatrix();
	glutSwapBuffers();											

	glFlush();												
}

oh, and any idea why glRotate wont work (when not commented) but glTranslate does. I've got the idle code to make it move and the push and pop matrix so can't figure it out myself....