Templates - General Questions

Which keyword can be used interchangeably with typename in a template parameter list?

What will be the output of the program?

#include <iostream>
using namespace std;
template <typename T>
struct Box { T v; T get() { return v; } };
int main() {
    Box<int> b{5};
    Box<char> c{'z'};
    cout << b.get() << c.get() << endl;
    return 0;
}

What will be the output of the program?

#include <iostream>
using namespace std;
template <typename T>
struct Stack {
    T d[10]; int top = 0;
    void push(T v) { d[top++] = v; }
    T pop() { return d[--top]; }
};
int main() {
    Stack<int> s;
    s.push(4); s.push(9);
    cout << s.pop() << s.pop() << 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;
}

What is template specialisation?