Question

Write a C++ program with a user-defined function myFactorial, that calculates the
factorial of a number entered by the user. Return the calculated factorial and print it in
the main function.

Answer 1

#include <iostream>

using namespace std;

int myFactorial(int n){
   if(n<0){
      return 0;
   }
   else if(n <= 1){
      return 1;
   }
   return n*myFactorial(n-1);
}

int main()
{
   int n;
   cout << "Enter a number: ";
   cin >> n;
   cout << n <<"! = " << myFactorial(n) << endl;
   return 0;
}