Factorial w recursion recall function.txt

#include <stdio.h>

// 5! = 1*2*3*4*5

// n! = 1*2*3*...*(n-1)*n

//recursion : one function calls itself

int factorial(int);

int main(void) {

    int n, facto;

    printf("Please enter a positive integer: ");

    scanf("%d",&n);

    if(n<0){

        printf("%d is negative! Aborting..\n", n);

    }else{

        facto = factorial(n);

        printf("%d! = %d.\n", n , facto);

    }
    
return 0;

}

int factorial(int n){

    int result;

    if(n==0){

        result=1;

    }else{

        result = n * factorial(n-1);

    }

    return result;

}