Template overloading

#include <iostream>
using namespace std;

template <class t>
t sum(t a,t b)
{
    return a+b;
}
template <class t>
t sum(t a,t b,t c)
{
    return a+b+c;
}
template <class t>
t sum(t a,t b,t c,t d)
{
    return a+b+c+d;
}
int main() {
   
    cout<<sum(10,20)<<"\n";
    cout<<sum(10,20,30)<<"\n";
    cout<<sum(10.2,20.2,9.4)<<"\n";
return 0;
}