#include <iostream>
// Function to calculate the factorial of a number
int factorial(int n) {
if (n == 0 || n == 1) {
return 1;
} else {
return n * factorial(n - 1);
}
}
int main() {
// Input: Get a number from the user
int number;
std::cout << "Enter a non-negative integer: ";
std::cin >> number;
// Check if the entered number is non-negative
if (number < 0) {
std::cout << "Please enter a non-negative integer." << std::endl;
return 1; // Exit the program with an error code
}
// Calculate and output the factorial of the entered number
int result = factorial(number);
std::cout << "Factorial of " << number << " is: " << result << std::endl;
return 0; // Exit the program successfully
}