大虾们帮我看看关于模板的问题！！！

#include <iostream>
using namespace std;

template <class eletype>  //这里把class换成typename也不对

eletype sum(eletype param1, eletype param2);

int main(void)
{
    int ia = 1, ib = 1, ic;
    float fa = 1.0f, fb = 1.0f, fc;
    double da = 1.0, db = 1.0, dc;
    
    ic = sum(ia, ib);
    fc = sum(fa, fb);
    dc = sum(da, db);
    
    cout<<"ia+ib="<<ic<<endl;
    cout<<"fa+fb="<<fc<<endl;
    cout<<"da+db="<<dc<<endl;
    
    return 0;
}

eletype sum(eletype param1, eletype param2)  //这里提示说“‘eletype’does not name a type”
{
    return param1+param2;
}