// Default values in a function
#include <iostream>
using namespace std;

float cylinderVolume(float radius, float height = 2.5){
  const float pi = 3.141593;
  return pi * radius * radius * height;
}

int main()
{
  float r = 1.1, h = 1.3;

  cout << cylinderVolume(r) << endl;
  cout << cylinderVolume(r, h) << endl;

  return 0;
}