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#include <iostream>
using namespace std;
 
template <class T>
void max (T x, T y)
{
string result;
if (x > y)
cout << x << " is bigger than " << y;
else if (x == y)
cout << x << " is equal to " << y;
else
cout << y << " is bigger than " << x;
}
 
int main()
{
double x = 5.6, y = 4.4;
max (x, y);
}
 

prog.cpp: In function ‘int main()’:
prog.cpp:19:10: error: call of overloaded ‘max(double&, double&)’ is ambiguous
 max (x, y);
          ^
prog.cpp:5:6: note: candidate: ‘void max(T, T) [with T = double]’
 void max (T x, T y)
      ^~~
In file included from /usr/include/c++/8/bits/char_traits.h:39,
                 from /usr/include/c++/8/ios:40,
                 from /usr/include/c++/8/ostream:38,
                 from /usr/include/c++/8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/8/bits/stl_algobase.h:219:5: note: candidate: ‘constexpr const _Tp& std::max(const _Tp&, const _Tp&) [with _Tp = double]’
     max(const _Tp& __a, const _Tp& __b)
     ^~~

Standard output is empty