fatal error LNK1120: 6 unresolved externals
--------------------Configuration: 班级 - Win32 Debug--------------------
Linking...
graduatelist.obj : error LNK2001: unresolved external symbol "public: __thiscall student::~student(void)" (??1student@@QAE@XZ)
studentlist.obj : error LNK2001: unresolved external symbol "public: __thiscall student::~student(void)" (??1student@@QAE@XZ)
ta.obj : error LNK2001: unresolved external symbol "public: __thiscall people::~people(void)" (??1people@@QAE@XZ)
teacherlist.obj : error LNK2001: unresolved external symbol "public: __thiscall people::~people(void)" (??1people@@QAE@XZ)
graduatelist.obj : error LNK2001: unresolved external symbol "public: __thiscall people::~people(void)" (??1people@@QAE@XZ)
mymain.obj : error LNK2001: unresolved external symbol "public: __thiscall people::~people(void)" (??1people@@QAE@XZ)
peoplelist.obj : error LNK2001: unresolved external symbol "public: __thiscall people::~people(void)" (??1people@@QAE@XZ)
studentlist.obj : error LNK2001: unresolved external symbol "public: __thiscall people::~people(void)" (??1people@@QAE@XZ)
teacherlist.obj : error LNK2001: unresolved external symbol "public: __thiscall date::~date(void)" (??1date@@QAE@XZ)
graduatelist.obj : error LNK2001: unresolved external symbol "public: __thiscall date::~date(void)" (??1date@@QAE@XZ)
peoplelist.obj : error LNK2001: unresolved external symbol "public: __thiscall date::~date(void)" (??1date@@QAE@XZ)
studentlist.obj : error LNK2001: unresolved external symbol "public: __thiscall date::~date(void)" (??1date@@QAE@XZ)
ta.obj : error LNK2001: unresolved external symbol "public: __thiscall date::~date(void)" (??1date@@QAE@XZ)
graduatelist.obj : error LNK2001: unresolved external symbol "public: __thiscall teacher::~teacher(void)" (??1teacher@@QAE@XZ)
mymain.obj : error LNK2001: unresolved external symbol "public: __thiscall teacher::~teacher(void)" (??1teacher@@QAE@XZ)
ta.obj : error LNK2001: unresolved external symbol "public: __thiscall teacher::~teacher(void)" (??1teacher@@QAE@XZ)
teacherlist.obj : error LNK2001: unresolved external symbol "public: __thiscall teacher::~teacher(void)" (??1teacher@@QAE@XZ)
graduatelist.obj : error LNK2001: unresolved external symbol "public: __thiscall graduate::~graduate(void)" (??1graduate@@QAE@XZ)
ta.obj : error LNK2001: unresolved external symbol "public: __thiscall graduate::~graduate(void)" (??1graduate@@QAE@XZ)
ta.obj : error LNK2001: unresolved external symbol "public: __thiscall ta::~ta(void)" (??1ta@@QAE@XZ)
Debug/班级.exe : fatal error LNK1120: 6 unresolved externals
执行 link.exe 时出错.
班级.exe - 1 error(s), 0 warning(s)
这个问题有没有的可以解决的办法?是程序本身的问题还是编程工具的问题?