Hey friends please explain me this code and say why its output is 4?

Question

include <iostream>
using namespace std;
int fact (int n) {
if(!n)
return 1;
return n*fact(n-1);
}
int main() {
cout<<fact(3)-fact(2);
return 0;
}
//output is 4 but why ?

Answer 1

The function fact returns the factorial of n - "the product of all positive integers less than or equal to n".

fact(3) = 3 * 2 * 1 = 6
fact(2) = 2 * 1 = 2
fact(3) - fact(2) = 4