سؤال عن الكومبايلر

ماهو كمبايلرك زماهي رسائل الخطاء؟

--------------------Configuration: main - Win32 Debug--------------------

Linking...

main.obj : error LNK2001: unresolved external symbol "public: void __thiscall Course::print(void)" (?print@Course@@QAEXXZ)

main.obj : error LNK2001: unresolved external symbol "public: __thiscall Course::Course(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,int)" (??0Course@@QAE@V?$basic_string@DU?$char_traits@D@std@@V?$allocator

@D@2@@std@@H@Z)

main.obj : error LNK2001: unresolved external symbol "public: void __thiscall Student::printDetails(void)" (?printDetails@Student@@QAEXXZ)

main.obj : error LNK2001: unresolved external symbol "public: __thiscall Student::Student(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class Date const &)" (??0Student@@QAE@V?$basic_string@DU?$char_traits@D

@std@@V?$allocator@D@2@@std@@ABVDate@@@Z)

main.obj : error LNK2001: unresolved external symbol "public: __thiscall Date::Date(int,int,int)" (??0Date@@QAE@HHH@Z)

Debug/main.exe : fatal error LNK1120: 5 unresolved externals

Error executing link.exe.

main.exe - 6 error(s), 0 warning(s)

الحين زادت صارت ست والله هبل فيني هالكومبايلر

ضع الكود ان امكن.