#include <sstream>
#include <iostream>
#include <string>
using namespace std;
 
template<class T>
string toString(T var)
{
    ostringstream ss;
    ss << var;
    return ss.str();
}
 
template<class T>
T fromString(string var)
{
    T tmp;
    istringstream ss(var);
    ss >> tmp;
    return tmp;
}
 
int main()
{
    string a;
    string b;
    float x = 5.0f;
    double z = 12.0;
    cout << (a=toString(x)) << "\t" << (b=toString(z)) << endl;
    cout << fromString<float>(a) << "\t" << fromString<double>(b) << endl;
    return 0;
}

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