C++ :

#include <iostream>
using namespace std;
enum planetName{Mecury,Venus,Earth,Mars,Jupiter,Saturn,Uranus,Neptune,Pluto};
planetName name;
int main()
{
        int a;
        cin>>a;
	while(cin)
	{
        name=planetName(a);
	switch(name)
	{
	case 0:cout<<"Mecury"<<endl;break;
	case 4:cout<<"Mars"<<endl;break;
	case 1:cout<< "Venus"<<endl;break;
	case 2:cout<< "Earth"<<endl;break;
    case 3:cout<<"Moon回车"<<endl;break;
	case 5:cout<< "Jupiter"<<endl;break;
	case 6:cout<< "Saturn"<<endl;break;
	case 7:cout<<"Uranus"<<endl;break;
	case 8:cout<<"Neptune"<<endl;break;
	case 9:cout<<"Pluto"<<endl;break;
	default:cout<< "Error"<<endl;break;
	}
		cin>>a;
	}
	return 0;
}