#include <bits/stdc++.h>
using namespace std;
int main(){
    double n;
    cin >> n;
    if(n==1){cout << "0.00000000";}
    else if(n==2){cout << "0.50000000";}
    else if(n==3){cout << "0.33333333";}
    else if(n==4){cout << "0.37500000";}
    else if(n==5){cout << "0.36666667";}
    else if(n==6){cout << "0.36805556";}
    else if(n==7){cout << "0.36785714";}
    else if(n==8){cout << "0.36788194";}
    else if(n==9){cout << "0.36787919";}
    else if(n==10){cout << "0.36787946";}
    else if(n==11){cout << "0.36787944";}
    else if(n==12){cout << "0.36787944";}
    else {cout << "0.36787944";}
    return 0;
}

F的值

我这种初学者，可以这样做[苦笑]

#include <bits/stdc++.h>
using namespace std;
int main(){
double n;
cin >> n;
if(n1){cout << "0.00000000";}
else if(n2){