//
// bs.h Black-Scholes header file
//
#include "gaussian.h"
struct valhedge {
  double value;
  double delta;};
class bs {
public:
  bs(double ttm=.25,double r=.05,double sigma=.3);
  void newpars(double ttm,double r,double sigma);
  valhedge call(double S0,double X);

private:
  valhedge ezcall(double stock,double bond,double vol);
  double disc,sigsqttm;};