void fitter()
{
   char name[2];
   name[1] = 0;

   TVirtualFitter::SetDefaultFitter("Minuit2");
   TVirtualFitter *fitter = TVirtualFitter::Fitter(0, 4);

   //The following loop below is expected to set the fitter 
   //parameters as:
   //
   // par[0]: name="0", value=0
   // par[1]: name="1", value=1
   // par[2]: name="2", value=2
   // par[3]: name="3", value=3

   for (int jj = 0; jj < 2; ++jj) {
      name[0] = char(jj+48);   //ASCII presentation of jj
      fitter->SetParameter(jj, name, jj, 0, 0, 0);
      name[0] = char(jj+48+2); //ASCII presentation of jj+2
      fitter->SetParameter(jj+2, name, jj+2, 0, 0, 0);
   }

   //See what we got:

   for (int jj = 0; jj < 4; ++jj) {
      cout << "par[" << jj << "]:\tname=" << fitter->GetParName(jj) 
           << "\tvalue=" << fitter->GetParameter(jj) << endl;
   }
   //It looks like SetParameter(...) ignores its' first argument
   //and set parameters sequentially...
}