#include <iostream>
using namespace std;
// 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);
}
}
// Main function
int main() {
// Declare variables
int num;
// Prompt user for input
cout << "Enter a non-negative integer: ";
cin >> num;
// Check if the input is non-negative
if (num < 0) {
cout << "Please enter a non-negative integer." << endl;
return 1; // Exit with an error code
}
// Calculate and display the factorial
cout << "Factorial of " << num << " = " << factorial(num) << endl;
return 0; // Exit successfully
}