/tmp/ccBOyjH7.o: In function `__static_initialization_and_destruction_0(int, int)':
GuessNumber.cpp:(.text+0x23): undefined reference to `std::ios_base::Init::Init()'
/tmp/ccBOyjH7.o: In function `__tcf_0':
GuessNumber.cpp:(.text+0x6c): undefined reference to `std::ios_base::Init::~Init()'
/tmp/ccBOyjH7.o: In function `isCorrect(int, int)':
GuessNumber.cpp:(.text+0x9c): undefined reference to `std::cout'
GuessNumber.cpp:(.text+0xa1): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
GuessNumber.cpp:(.text+0xb2): undefined reference to `std::cout'
GuessNumber.cpp:(.text+0xb7): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
/tmp/ccBOyjH7.o: In function `guessGame()':
GuessNumber.cpp:(.text+0x113): undefined reference to `std::cout'
GuessNumber.cpp:(.text+0x118): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
GuessNumber.cpp:(.text+0x128): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
GuessNumber.cpp:(.text+0x138): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
GuessNumber.cpp:(.text+0x140): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)'
GuessNumber.cpp:(.text+0x148): undefined reference to `std::basic_ostream<char, std::char_traits<char> >::operator<<(std::basic_ostream<char, std::char_traits<char> >& (*)(std::basic_ostream<char, std::char_traits<char> >&))'
GuessNumber.cpp:(.text+0x158): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
GuessNumber.cpp:(.text+0x166): undefined reference to `std::cin'
GuessNumber.cpp:(.text+0x16b): undefined reference to `std::basic_istream<char, std::char_traits<char> >::operator>>(int&)'
GuessNumber.cpp:(.text+0x17b): undefined reference to `std::cin'
GuessNumber.cpp:(.text+0x180): undefined reference to `std::basic_istream<char, std::char_traits<char> >::operator>>(int&)'
GuessNumber.cpp:(.text+0x1a8): undefined reference to `std::cout'
GuessNumber.cpp:(.text+0x1ad): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
GuessNumber.cpp:(.text+0x1bd): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
GuessNumber.cpp:(.text+0x1cb): undefined reference to `std::cin'
GuessNumber.cpp:(.text+0x1d0): undefined reference to `std::basic_istream<char, std::char_traits<char> >& std::operator>><char, std::char_traits<char> >(std::basic_istream<char, std::char_traits<char> >&, char&)'
GuessNumber.cpp:(.text+0x1d8): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)'
GuessNumber.cpp:(.text+0x1df): undefined reference to `std::cout'
GuessNumber.cpp:(.text+0x1e4): undefined reference to `std::basic_ostream<char, std::char_traits<char> >::operator<<(std::basic_ostream<char, std::char_traits<char> >& (*)(std::basic_ostream<char, std::char_traits<char> >&))'
/tmp/ccBOyjH7.o:(.eh_frame+0x11): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status