import java.util.Scanner; public class ScoreAverage { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); int score = 0; int sum = 0; int count = -1; while(score != -1) { count++; sum += score; System.out.print("輸入分數(-1結束)："); score = scanner.nextInt(); } System.out.println("平均：" + (double) sum/count); } }