#include <iostream>
// Function to calculate the factorial of a number
int calculateFactorial(int n) {
if (n == 0 || n == 1) {
return 1;
} else {
return n * calculateFactorial(n - 1);
}
}
// Main function
int main() {
// Input: Get the number from the user
int num;
std::cout << "Enter a non-negative integer: ";
std::cin >> num;
// Check if the input is non-negative
if (num < 0) {
std::cout << "Factorial is undefined for negative numbers." << std::endl;
} else {
// Calculate and display the factorial
int result = calculateFactorial(num);
std::cout << "Factorial of " << num << " is: " << result << std::endl;
}
return 0;
}