C++ const double Get weight of a cylinder from its volume and density

#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;
int main()/*from   w  w  w . jav  a 2  s  .  c  o  m*/
{
   const double PI = 3.1416;
   const double DENSITY = 0.284;
   double radius, height, weight;
   cout << "Enter the radius of the cylinder (in inches): ";
   cin  >> radius;
   cout << "Enter the height of the cylinder (in inches): ";
   cin  >> height;
   weight = DENSITY * PI * pow(radius,2) * height;
   cout << setiosflags(ios:: fixed) << setiosflags(ios::showpoint) << setprecision(4) << "The cylinder weighs " << weight << " pounds" << endl;
   return 0;
}