1.      Program to find the factorial of a number using recursion.

1. #include <iostream.h>

2. #include <conio.h>

3. int factorial(int n) {

4.     if (n == 0) {

5.         return 1;

6.     } else {

7.         return n * factorial(n - 1);

8.     }

9. }

10.  

11. int main() {

12.     int num, result;

13.     cout << "Enter a non-negative integer: ";

14.     cin >> num;

15.     result = factorial(num);

16.     cout << "The factorial of " << num << " is " << result << endl;

17.     getch();

18.     return 0;

20. }