fork download 
  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n;
  6. 	cout << "enter a non-negative integer: ";
  7. 	cin >> n;
  8.  
  9. 	while (n < 0) {
  10. 		cout << "invalid input! enter a non-negative integer: ";
  11. 		cin >> n;
  12. 	}
  13.  
  14. 	unsigned long long factorial = 1;
  15.  
  16. 	for (int i = 1; i <= n; i++) {
  17. 		factorial *= i;
  18. 	}
  19.  
  20. 	cout << n << "! = " << factorial << endl;
  21.  
  22. 	return 0;
  23. }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin 
Standard input is empty
stdout 
enter a non-negative integer: 21930! = 0
https://ideone.com/SV4luW
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!