The program rootTest.cc is a standalone C++ program that uses ROOT
classes to book, fill and store some histograms.  To build the program
at RHUL, download all the files to a separate directory. Then build
the program as usual by typing

gmake

When you run the program it will display a histogram of a uniform
distribution and it will also create a file called test.root, which
contains two histograms, called h1 and h2.  Often one uses a
standalone C++ program to create n-tuples or histograms, and then one
uses the ROOT program itself to view and manipulate the histograms.

A minimal root session to view the histograms could be:

> root                         <--- prompt is ">", you type "root".  
******************************
* Welcome to ROOT v5.10/00 *
******************************
 
root [0] TFile* f = new TFile("test.root");
root [1] f->ls();
TFile**         test.root
 TFile*         test.root
  KEY: TH1F     h1;1    uniform r
  KEY: TH1F     h2;1    r1 + r2 - 1
root [2] h1->Draw();
<TCanvas::MakeDefCanvas>: created default TCanvas with name c1
root [3] h2->Draw();
root [4] .q


Good luck,

GC