C++ Clan

In mathematics, the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example,

The value of 0! is 1, according to the convention for an empty product
(for more info visit Factorial on Wiki )

Code:

#include
using namespace std;

int main()
{
 int factorial = 1, value = 1;
 cout << "Please enter value to find its factorial" << endl;
 cin >> value; int temporary = value;
 if (value < 0)
 {
  cout << "please enter a positive number ";
  main();
 }
 else if (value<2)
 {
  cout << "factorial of " << value << " is " << 1 << endl;
 }
 else
 {
  for (; temporary>1; factorial *= temporary--);
  cout << "factorial of " << value << " is " << factorial << endl;
  return 0;
 }
}