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#include <iostream>
template <typename T>
int plus(T &a,T &b);
int main()
{
using namespace std;
int i=2;
int j=4;
cout<< "сумма "<<i<<" и "<<j<<"равна "<<plus(i,j);
return 0;
}
template <typename T>
int plus(T &a,T &b)
{
	T temp;
	temp=a+b;
	return temp;
}
 

prog.cpp: In function 'int main()':
prog.cpp:9:52: error: reference to 'plus' is ambiguous
 cout<< "сумма "<<i<<" и "<<j<<"равна "<<plus(i,j);
                                                    ^
prog.cpp:3:5: note: candidates are: template<class T> int plus(T&, T&)
 int plus(T &a,T &b);
     ^
In file included from /usr/include/c++/5/string:48:0,
                 from /usr/include/c++/5/bits/locale_classes.h:40,
                 from /usr/include/c++/5/bits/ios_base.h:41,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/stl_function.h:147:12: note:                 template<class _Tp> struct std::plus
     struct plus;
            ^

Standard output is empty