Function factorial

Chapter 5/05_recursion.c:10–16

    //  = 1 x 2 X 3 X .... X n-1

int factorial(int n){ 
    if(n == 1 || n == 0){ // Base condition
        return 1;
    }
    // Factorial(n) = Factorial(n-1) X n
    return n * factorial(n-1);
}

int main(){
    int a = 6;