Factorial of a Number using Recursion

The factorial of any number is given by the product of 1 to the number itself.

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Fact (n) = 1 * 2 * 3 * … * n-1 * n

Key Points:

  1. The factorial of any negative number doesn’t exist.
  2. Factorial of 0 is 1.
#include <stdio.h>
int fact(int n)
     return n;
     return n*fact(n-1);
int main() {
    int n, i;
    int res;
    printf("Enter a number");
    scanf("%d", &n);
    if (n < 0)
        printf("\n Factorial of a negative number does not exists");
    else {
        printf("Factorial of %d is %d", n, res);

    return 0;

Also check: FACTORIAL OF A NUMBER USING ITERATION LOOP https://www.mycodingguide.live/find-the-factorial-of-a-number/

Explaination :

The program takes an integer n as input and checks if is positive. If negative, then display an error message. Else, calculate its factorial using recursion. The base case of this recursive function is: if(n<=1) return n

def factorial(n):
if n == 0 or n == 1:
return 1
return n * factorial(n-1)

Example: Factorial of 3= 3*2*1