参考代码:
import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); int n = scanner.nextInt(); double numerator = 2; double denominator = 1; double sum = 0; for(int i = 1; i <= n; i++) { sum += numerator / denominator; numerator += denominator; denominator = numerator - denominator; } System.out.printf("%.4f", sum); } }
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