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  1. #include <iostream>
  2. #include <iomanip>
  3. using namespace std;
  4.  
  5. int getNumber() {
  6. 	int n;
  7. 	do {
  8. 		cout << "Enter a non-negative number!\n";
  9. 		cin >> n;
  10. 	} while (cin && n < 0);
  11. 	return n;
  12. }
  13.  
  14. int main() {
  15.     int n = getNumber();
  16.     long double factorial = 1;
  17.     for (int i = 1; i <= n; ++i)
  18.         factorial *= i;
  19.     // cout.precision(2);
  20.     cout << n << "! = "  << factorial;
  21.     return 0;
  22. }
Success #stdin #stdout 0s 3460KB
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stdin
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13
stdout
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Enter a non-negative number!
13! = 6.22702e+09
https://ideone.com/bH1HXX
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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