刚开始学c++，还没入门，请大家指点一上

刚开始学c++，还没入门，请大家指点一下

C/C++ code

#include<stdio.h>struct BOX{         int Size;         Increase(int Value);}BOX;Increase(int Value){    BOX.Size=BOX.Size+Value;}main(){    BOX.Size=9;    BOX.Increase(3);    printf("%d",BOX.Size);}

运行是出错：error LNK2001: unresolved external symbol "public: int __thiscall BOX::Increase(int)" (?Increase@BOX@@QAEHH@Z)

[解决办法]
对的，楼主系按找本C++ primer看看，C++庞杂得很，最好系统学一下