The factorial of a positive number n is given by:
factorial of n (n!) = 1 * 2 * 3 * 4 *... * n
The factorial of a negative number doesn't exist. And the factorial of
0 is 1.
You will learn to find the factorial of a number using recursion in this example. Visit this page to learn how you can find the factorial of a number using a loop.
Factorial of a Number Using Recursion
Output
Enter a positive integer: 6 Factorial of 6 = 720
Suppose the user entered 6.
Initially, multiplyNumbers() is called from
main() with 6 passed as an argument.
Then, 5 is passed to multiplyNumbers() from the same function
(recursive call). In each recursive call, the value of argument
n is decreased by 1.
When the value of n is less than 1, there is no recursive call and
the factorial is returned ultimately to the main() function.