#include<iostream.h>
class point
{
public:
    void initp(float xx=0,float yy=0)
{x=xx;y=yy;}
private:
    float x,y;
};   
class water:public point
    {
    public:
        void initr(float a=0,float b=0,float c=0)
{initp(a,b);m=c;}
    private:
        float m;
    };
int main()
{
    water f;
    f.initr(3,4,5);
    return 0;
}
55.obj : error LNK2005: _main already defined in 11.obj
Debug/11.exe : fatal error LNK1169: one or more multiply defined symbols found
Error executing link.exe.

按照书上一模一样的，为什么就是调试出错，请高手帮忙。