#include"TCanvas.h"
#include"TF1.h"
#include"TROOT.h"
#include"TMath.h"
#include"TGraph.h"
#include"TH1.h"

void sample()

{

ifstream mydat("test2.txt");
  
TCanvas* c1 = new TCanvas("c1","Graph");

float x,y;

TH1F *hist = new TH1F("hist","Histogram",5,0.5,5.5);

 while(!mydat.eof()) {
   mydat >> x >> y;
   hist->Fill(x,y);
 }


hist->SetMarkerStyle(3);
hist->Draw();
mydat.close();

}