Heres the code. if ((2.0/3.0) != MyAnn::getCondProb(std::string("+cancer"), std::string("+test"), vps)); BOOST_ERROR("getCondProb"); if((1.0/2.0) != MyAnn::getProb(std::string("+cancer"), vps, 1)); BOOST_ERROR("getProb"); if((3.0/4.0) != MyAnn::getProb(std::string("+test"), vps, 2)); BOOST_ERROR("getProb"); if((1.0/2.0) != MyAnn::getProbAND(std::string("+cancer"), std::string("+test"), vps)); BOOST_ERROR("getCondProbAND"); if((3.0/4.0) != MyAnn::getProbOR(std::string("+cancer"), std::string("+test"), vps)); BOOST_ERROR("getCondProbOR"); BOOST_CHECK((2.0/3.0) == MyAnn::getCondProb(std::string("+cancer"), std::string("+test"), vps)); BOOST_CHECK((1.0/2.0) == MyAnn::getProb(std::string("+cancer"), vps, 1)); BOOST_CHECK((3.0/4.0) == MyAnn::getProb(std::string("+test"), vps, 2)); BOOST_CHECK((1.0/2.0) == MyAnn::getProbAND(std::string("+cancer"), std::string("+test"), vps)); BOOST_CHECK((3.0/4.0) == MyAnn::getProbOR(std::string("+cancer"), std::string("+test"), vps)); Heres the result: C:\CPW\cs_classes\cs461\c++\BayesianTest.cpp(144): getCondProb in function: 'int test_main(int, char**)' C:\CPW\cs_classes\cs461\c++\BayesianTest.cpp(146): getProb in function: 'int tes t_main(int, char**)' C:\CPW\cs_classes\cs461\c++\BayesianTest.cpp(148): getProb in function: 'int tes t_main(int, char**)' C:\CPW\cs_classes\cs461\c++\BayesianTest.cpp(150): getCondProbAND in function: ' int test_main(int, char**)' C:\CPW\cs_classes\cs461\c++\BayesianTest.cpp(152): getCondProbOR in function: 'i nt test_main(int, char**)' C:\CPW\cs_classes\cs461\c++\BayesianTest.cpp(156): test (1.0/2.0) == MyAnn::getP robAND(std::string("+cancer"), std::string("+test"), vps) failed in function: 'i nt test_main(int, char**)' C:\CPW\cs_classes\cs461\c++\BayesianTest.cpp(157): test (3.0/4.0) == MyAnn::getP robOR(std::string("+cancer"), std::string("+test"), vps) failed in function: 'in t test_main(int, char**)' C:/Boost/include/boost_1_34/boost/test/minimal.hpp(122): exception "std::excepti on: boost::bad_format_string: format-string is ill-formed" caught in function: ' int main(int, char**)' I like to know what went wrong .. and how come its failing? its using boost 1.34