// HEADER file for gfun1.cpp
// FILENAME: gfun1.h
// PROGRAMMER: Dr.Iz (Urieli) 9/10/03
using namespace std;

float const PI = 3.141593;
class Pendulum{
 private:
   float length; // [m] pendulum length
 public:
   float g_base; // [m/s^2] baseline value of g
   Pendulum(float x = 1.0) { // Constructor for Pendulum
      g_base = 9.807; // [m/s^2]
      length = x;
      cout << "pendulum length set at " << length << "[m]\n";
      cout << "for baseline gravity of " << g_base << "[m/s^2]\n";
      cout << "small angle period is "
           << 2*PI*sqrt(length/g_base) << "[s]\n"; 
   }
   float find_g(float period);
   // function to determine local acceleration due to gravity g
   //     based on a pendulum experiment
   // pre: argument "period" and pendulum "length" have values
   // post: value of g has been evaluated and returned.
};
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