Introduction to Recursion

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#include <bits/stdc++.h>
using namespace std ;

int fact(int n){
    if (n < 0) return -1 ;
    if (n==0) return  1;
    int small_ans = fact(n-1);
    return  n*small_ans ;

}

int main (){
    int n ;
    cin >> n ;

    int ans = fact(n);
    cout << ans << '\n';
    return 0;
}

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