template<class T>
T TSWAP(T a, T b)
{
    return a > b ? a : b;    
}
int main()
{
    cout << TSWAP(9, 20) << endl;
    /*cout << TSWAP<int>(9, 20) << endl;*//*也可行;*/
    cout << TSWAP(9.5, 6.3) << endl;
    return 0;
}