参考代码:
import java.util.Scanner; public class Main { public static double fact(int k){ double sum=1; for (int i = 2; i <= k; i++) { sum *= i; } return sum; } public static void main(String[] args) { Scanner in = new Scanner(System.in); int n = in.nextInt(); double sum = 1; for (int i = 2; i <= n; i++) { sum += 1/fact(i); } System.out.println("sum="+String.format("%.5f", sum)); } }
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