编译时链接错误怎么会事!
Compiling...
Manage_Salary.cpp
Linking...
Manage_Salary.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall Employee::set_salary(double)" (?set_salary@Employee@@UAEXN@Z)
Manage_Salary.obj : error LNK2001: unresolved external symbol "public: virtual double __thiscall Employee::get_salary(void)" (?get_salary@Employee@@UAENXZ)
Debug/Salary_Manage.exe : fatal error LNK1120: 2 unresolved externals
Error executing link.exe.
Salary_Manage.exe - 3 error(s), 0 warning(s)
以上是编译出现的情况,请问错在哪了?