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// 04-constexpr.cpp : use of a constexpr function with static_assert

import std;

using namespace std;

constexpr int factorial(int n) {

if (n < 2) {

return 1;

}

else {

return n * factorial(n - 1);

}

static_assert(factorial(0) == 1);

static_assert(factorial(5) == 120);

int main() {

cout << "Please enter a number: ";

int n{};

cin >> n;

cout << n << "! = " << factorial(n) << '\n';

}