Fill in the blanks to print 5.

Question

template<_A>
int sum(int n)
{return A+n;
}
int main()
{cout<<sum<__>(2);

Answer 1

template<int A>
...
cout<<sum<3>(2);

The above uses the fact that templates can have 'non-type' arguments as well. In fact, for C++17 (and beyond) you can use 'auto' instead of 'int' and the compiler will infer the type.