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  1. #include <iostream>
  2.  
  3. constexpr int factorial(int n) // Everything here is known at compile time
  4. {
  5.     return n <= 1 ? 1 : (n * factorial(n - 1));
  6. }
  7.  
  8. int main(void)
  9. {
  10.     int i;
  11.     std::cin >> i;
  12. 	const int f = factorial(i); // I really can't guess this at compile time..
  13. 	std::cout << f << std::endl;
  14. 	return 0;
  15. }
Success #stdin #stdout 0s 3300KB
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https://ideone.com/x5LuxF
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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