Templates - General Questions

What will be the output of the program?

#include <iostream>
using namespace std;
template <typename T, int N>
int size(T (&)[N]) { return N; }
int main() {
    int a[7];
    cout << size(a) << endl;
    return 0;
}

When are templates instantiated?

What will be the output of the program?

#include <iostream>
using namespace std;
template <typename T, typename U>
struct Pair { T a; U b; };
int main() {
    Pair<int, char> p{65, 'B'};
    cout << p.a << p.b << endl;
    return 0;
}

What will be the output of the program?

#include <iostream>
using namespace std;
template <typename T>
T maxOf(T a, T b) { return a > b ? a : b; }
int main() {
    cout << maxOf(3, 9) << " " << maxOf(2.5, 1.5) << endl;
    return 0;
}

What will be the output of the program?

#include <iostream>
using namespace std;
template <typename T>
void show(T v) { cout << "T"; }
template <>
void show<int>(int v) { cout << "int"; }
int main() {
    show(1.0);
    show(1);
    cout << endl;
    return 0;
}