code/class/e_de_jin_se_zhi.cpp
2025-02-03 11:23:49 +08:00

19 lines
293 B
C++

#include<iostream>
#include<iomanip>
using namespace std;
int main(){
double e = 1.0;
double factorial = 1.0;
for (int i = 1; i <= 20; i++)
{
factorial *= i;
e += 1.0 / factorial;
}
cout << fixed << setprecision(3) << e << endl;
return 0;
}