└── README.md


/README.md:
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 1 | #include <stdio.h>
 2 | 
 3 | // Function to calculate factorial
 4 | int factorial(int n) {
 5 |     if (n == 0 || n == 1)
 6 |         return 1;
 7 |     else
 8 |         return n * factorial(n - 1);
 9 | }
10 | 
11 | // Main function
12 | int main() {
13 |     int num;
14 |     printf("Enter a non-negative integer: ");
15 |     scanf("%d", &num);
16 | 
17 |     if (num < 0) {
18 |         printf("Factorial is not defined for negative numbers.\n");
19 |     } else {
20 |         int fact = factorial(num);
21 |         printf("Factorial of %d is: %d\n", num, fact);
22 |     }
23 | 
24 |     return 0;
25 | }
26 | 


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