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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int n;
  6.     long double factorial = 1.0;
  7.  
  8.     cout << "Enter a positive integer: ";
  9.     cin >> n;
  10.  
  11.     if (n < 0)
  12.         cout << "Error! Factorial of a negative number doesn't exist.";
  13.     else {
  14.         for(int i = 1; i <= n; ++i) {
  15.             factorial *= i;
  16.         }
  17.         cout << "Factorial of " << n << " = " << factorial;    
  18.     }
  19.  
  20.     return 0;
  21. }
Success #stdin #stdout 0.01s 5548KB
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stdin
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5
stdout
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Enter a positive integer: Factorial of 5 = 120
https://ideone.com/S9Ko9k
language:
C++ 4.3.2 (gcc-4.3.2)
created:
1 year ago
visibility:
public

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