小弟是初学者，昨天刚敲完一程序，编译没有错误，运行报错：
Linking...
useDatabase.obj : error LNK2001: unresolved external symbol "public: void __thiscall Personal::readKey(void)" (?readKey@Personal@@QAEXXZ)
useDatabase.obj : error LNK2001: unresolved external symbol "public: __thiscall Student::Student(void)" (??0Student@@QAE@XZ)
useDatabase.obj : error LNK2001: unresolved external symbol "public: void __thiscall Student::readFromFile(class fstream &)" (?readFromFile@Student@@QAEXAAVfstream@@@Z)
useDatabase.obj : error LNK2001: unresolved external symbol "public: void __thiscall Student::writeToFile(class fstream &)const " (?writeToFile@Student@@QBEXAAVfstream@@@Z)
useDatabase.obj : error LNK2001: unresolved external symbol "protected: class ostream & __thiscall Student::writeLegibly(class ostream &)" (?writeLegibly@Student@@IAEAAVostream@@AAV2@@Z)
useDatabase.obj : error LNK2001: unresolved external symbol "protected: class istream & __thiscall Student::readFromConsole(class istream &)" (?readFromConsole@Student@@IAEAAVistream@@AAV2@@Z)
Debug/useDatabase.exe : fatal error LNK1120: 6 unresolved externals
执行 link.exe 时出错.




baidu了n次还是不明白，望高人指点。

你必须把主文件里面的那三个头文件包含到你建的这个工程里面,这样才能运行.

你下次先建立一个工程,然后再定义编辑各种文件并复选中"添加到这个工程",这样所有的文件就在这个工程里面了,不会出现不包含的情况.