#include <stdio.h>
// 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
printf("Enter a non-negative integer: ");
scanf("%d", &num);
// Check if the input is a non-negative integer
if (num < 0) {
printf("Please enter a non-negative integer.\n");
} else {
// Calculate and display the factorial
int result = factorial(num);
printf("The factorial of %d is: %d\n", num, result);
}
return 0;
}