There seems to be no good way to directly convert an enum class to string in C++11.

#include <iostream>
using namespace std;
enum class Fruit { apple, orange, pear };
enum class Color { red, green, orange };

template <typename T> struct Traits;

template<>
struct Traits<Fruit>
{
    static string name(int index) 
    {
        switch(index)
        {
            case 0: return "apple";
            case 1: return "orange";
            case 2: return "pear";
            default: return "unknown";
        }
    }
};

template<>
struct Traits<Color>
{
    static string name(int index)
    {
        switch(index)
        {
            case 0: return "red";
            case 1: return "green";
            case 2: return "orange";
            default: return "unknown";
        }
    }
};

int main()
{
	int t = 0; std::cin >> t;

    for (int i=0; i!=t; ++i) {
        int index1; std::cin >> index1;
        int index2; std::cin >> index2;
        cout << Traits<Color>::name(index1) << " ";
        cout << Traits<Fruit>::name(index2) << "\n";
    }
}