这段无法通过编译诶 求解~

#include "stdafx.h"
class Animal{
public:
void eat(){cout<<"Animal eat"<<endl;}
void sleep(){cout<<"Animal sleep"<<endl;}
Animal(int a,int b){cout<<"a";}
~Animal(){cout<<"Animal";}
};
class Fish:public Animal{
public:    Fish():Animal(50,40)   
void eat(){cout<<"Fish eat"<<endl;}   
void sleep(){cout<<"Fish sleep"<<endl;}
~Fish(){cout<<"Fish";}};
int _tmain(int argc, _TCHAR* argv[])
{   Animal an;
Fish fh;
fh.eat();  
   fh.sleep();   
   getchar();
return 0;}
练习的随便写的 通过不了 求解呀