Factorial Using Recursion in C++

#include<iostream>
using namespace std;
int main()
{
    int factorial(int);
    int fact,value;
   
    cout<<"Enter any number=";
    cin>>value;
    fact=factorial(value);
   
    cout<<"Factorial of "<<value<<" is : "<<fact;
    return 0;
}
int factorial(int n)
{
    if(n<0)
    {
   
    return(-1); //wrong value
    }
   
    if(n==0)
    {
   
    return(1); //terminating condition
    }
   
    else
    {
        return(n*factorial(n-1));   
    }
}