C++ 计算阶乘倒数和并加1

#include #include

using namespace std;

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

double sum = 1.0; // 初始值为1

for (int i = 1; i <= n; i++) {
    double factorial = 1.0;
    for (int j = 1; j <= i; j++) {
        factorial *= j;
    }
    sum += 1 / factorial;
}

cout << fixed << setprecision(10) << sum << endl;
return 0;

}