Now I know that the working for factorial isCode:#include <iostream> using namespace std; double factorial ( double a ) { if (a > 1 ) return ( a * factorial (a -1) ); else return (1); } int main() { double num; cout << "Enter a number: "; cin >> num; cout << num << "! = " << factorial(num); system("pause"); return 0; }

n! = n * ( n - 1) * ( n - 2) * ( n - 3) .... * 1

but I can't see how this is implemented on the code.

Please help me to understand the code. Thanks.