1>CTreeValue.obj : error LNK2019: unresolved external symbol "public: __thiscall CTree::CTree(void)" (??0CTree@@QAE@XZ) referenced in function "public: __thiscall CTreeValue::CTreeValue(float,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)" (??0CTreeValue@@QAE@MV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)

1>main.obj : error LNK2019: unresolved external symbol "public: __thiscall CTreeOperator::CTreeOperator(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)" (??0CTreeOperator@@QAE@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) referenced in function _main

1>C:\Users\Tom\documents\visual studio 2010\Projects\Lista3\Debug\Lista3.exe : fatal error LNK1120: 2 unresolved externals