#include "TObject.h"
#include "TCanvas.h"
#include "TH1D.h"
#include "TH1F.h"
#include "TROOT.h"

class ABC : public TObject {

public:

// define a function with 2 parameters
Double_t fitf(Double_t *x,Double_t *par)
{
Double_t fitval = par[0]*x[0] + par[1];
return fitval;
}


void fitexample() 
{
TH1D *htest = new TH1D("htest", "Fake Data; Bin; Fake Data", 10, 0., 10.);
for (Int_t i=0; i<10; i++)
  htest->SetBinContent(i,(float)i);

// Create a TF1 object using the function defined above. The last three
// parameters specify the number of parameters for the function.
TF1 *func = new TF1("fit",fitf,-2,2,2);
// call TH1::Fit with the name of the TF1 object
htest->Fit("fit");
}





   // Define the class for the cint dictionary
   ClassDef (ABC, 1)
};

// Call the ClassImp macro to give the ABC class RTTI and full I/O capabilities.
#if !defined(__CINT__)
   ClassImp(ABC);
#endif