"`cout' undeclared" despite #include <iostream>

From: Vassili Maroussov <vmarusov_at_fnal.gov>
Date: Tue, 14 Mar 2006 14:56:13 +0100

Dear ROOTers,

I cannot compile the file in the attachment, although the <iostream> is included:

---

[pcmspur5] ~/TreePlay > g++ -c count_trees.cxx -I`root-config --incdir`

count_trees.cxx: In function `int count_trees(const char*)':
count_trees.cxx:20: `cerr' undeclared (first use this function)
count_trees.cxx:20: (Each undeclared identifier is reported only once 

for each

   function it appears in.)
count_trees.cxx:20: `endl' undeclared (first use this function) count_trees.cxx:45: `cout' undeclared (first use this function) [pcmspur5] ~/TreePlay >

---

What may be a reason for that? I use ROOT 5.06 and gcc 3.2.3 (Red Hat Linux 3.2.3-53)

Regards,

Vassili.

#include <iostream>

#include <Ttypes.h>
#include <TSystem.h>
#include <TFile.h>
#include <TTree.h>
#include <TKey.h>

#include <libgen.h> //to use basename(char *)

int count_trees(const char *file0)
{
//Counts number of object inherited from TTree in file0 and //reports number of objects of unknown type

   char *file = gSystem->ExpandPathName(file0);    

        TFile f(file, "READ");
   if (f.IsZombie()) {

      cerr << "ERROR (count_trees): cannot open " << file << endl;
      return -1;

   }    

	TList *li = f.GetListOfKeys();
	TKey *key;
	TClass *cl = 0;
	TIter next(li);
   

   Int_t ntrees = 0;
   Int_t nunknowns = 0;

	while ((key = (TKey*)next())) {
		cl = gROOT->GetClass(key->GetClassName());

      // the case of unknown object
		if (!cl) {
         nunknowns++;
         continue;
		}
		// the case of tree
		if (cl->InheritsFrom(TTree::Class())) {
         ntrees++;
		}
	}
   cout << file      << " : "
        << ntrees    << " trees, "
        << nunknowns << " unknown objects." << endl;
        

   return 0;
}

void usage_help(char *pname)
{

   cout << "\n\"" << basename(pname) << "\" counts number of TTrees\n";
   cout << "and unknown objects in the input_file\n\n";
   cout << "Usage:\n\t" << basename(pname) << " input_file" << endl;

}

int main(int argc, char *argv[])
{

   if (argc != 2) {

      usage_help(argv[0]);
      return -1;

   }    

   count_trees(argv[1]);
   return 0;
} Received on Tue Mar 14 2006 - 14:56:27 MET