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error in compiling | ruchi01 (5) |  |
| Hi! I am a beginner to c++. I tried to compile and link following code #include "Pythia.h" #include "TH1.h" #include "TTree.h" #include "TFile.h" using namespace Pythia8; int ex1() { // Generator. Process selection. LHC initialization. Histogram. Pythia pythia; pythia.readString("HardQCD:all = on"); pythia.readString("PhaseSpace:pTHatMin = 20."); pythia.init( 2212, 2212, 14000.); TFile *file = TFile::Open("ex1.root","recreate"); Event *event = &pythia.event; TTree *T = new TTree("T","ev1 Tree"); T->Branch("event","Event",&event); TH1F *mult = new TH1F("mult","charged multiplicity", 100, -0.5, 799.5); // Begin event loop. Generate event. Skip if error. List first one. for (int iEvent = 0; iEvent < 100; ++iEvent) { if (!pythia.next()) continue; //if (iEvent < 1) {pythia.info.list(); pythia.event.list();} // Find number of all final charged particles and fill histogram. int nCharged = 0; for (int i = 0; i < pythia.event.size(); ++i) if (pythia.event[i].isFinal() && pythia.event[i].isCharged()) ++nCharged; mult->Fill( nCharged ); T->Fill(); // End of event loop. Statistics. Histogram. Done. } pythia.statistics(); cout << mult; T->Print(); T->Write(); delete file; return 0; } I used the command g++ -o2 -L$ROOTSYS/lib -L$PYTHIA8/lib -I$ROOTSYS/include -I$PYTHIA8/include main01_r.cc and i got this /usr/lib/gcc/i386-redhat-linux/3.4.6/../../../crt1.o(.text+0x18): In function `_start': : undefined reference to `main' /tmp/cclhLO7b.o(.text+0x148): In function `ex1()': : undefined reference to `Pythia8::Pythia::Pythia(std::basic_string<char, std::char_traits<char>, std::allocator<char> >)' /tmp/cclhLO7b.o(.text+0x213): In function `ex1()': : undefined reference to `Pythia8::Pythia::readString(std::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool)' /tmp/cclhLO7b.o(.text+0x2d5): In function `ex1()': : undefined reference to `Pythia8::Pythia::readString(std::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool)' /tmp/cclhLO7b.o(.text+0x374): In function `ex1()': : undefined reference to `Pythia8::Pythia::init(int, int, double)' /tmp/cclhLO7b.o(.text+0x392): In function `ex1()': : undefined reference to `TFile::Open(char const*, char const*, char const*, int, int)' /tmp/cclhLO7b.o(.text+0x3d7): In function `ex1()': : undefined reference to `TTree::TTree(char const*, char const*, int)' /tmp/cclhLO7b.o(.text+0x3f6): In function `ex1()': : undefined reference to `TObject::operator delete(void*)' /tmp/cclhLO7b.o(.text+0x47e): In function `ex1()': : undefined reference to `TH1F::TH1F(char const*, char const*, int, double, double)' /tmp/cclhLO7b.o(.text+0x49d): In function `ex1()': : undefined reference to `TObject::operator delete(void*)' /tmp/cclhLO7b.o(.text+0x4dd): In function `ex1()': : undefined reference to `Pythia8::Pythia::next()' /tmp/cclhLO7b.o(.text+0x5ec): In function `ex1()': : undefined reference to `Pythia8::Pythia::statistics(bool, bool)' /tmp/cclhLO7b.o(.text+0x67a): In function `ex1()': : undefined reference to `Pythia8::Pythia::~Pythia()' /tmp/cclhLO7b.o(.text+0x6a4): In function `ex1()': : undefined reference to `Pythia8::Pythia::~Pythia()' /tmp/cclhLO7b.o(.text+0x723): In function `__static_initialization_and_destruction_0(int, int)': : undefined reference to `TVersionCheck::TVersionCheck(int)' /tmp/cclhLO7b.o(.gnu.linkonce.t._ZN7TObjectnwEj+0xd): In function `TObject::operator new(unsigned int)': : undefined reference to `TStorage::ObjectAlloc(unsigned int)' /tmp/cclhLO7b.o(.gnu.linkonce.t._ZN5TTree6BranchIN7Pythia85EventEEEP7TBranchPKcS6_PPT_ii+0x27):In function `TBranch* TTree::Branch<Pythia8::Event>(char const*, char const*, Pythia8::Event**,int, int)': : undefined reference to `TBuffer::GetClass(std::type_info const&)' collect2: ld returned 1 exit status Can anyone please tell where the problem is? Thanks in advance! | |
| kbw (1505) | |
| Please use the code formating tag on the right to format your code. The first error says your program doesn't provide a function main.The remainder seem to be caused by you not linking to the right libraries. | |
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