package org.example;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

public class ScoreReader {
    public static void main(String[] args) {

    int sum = 0;
    int count = 0;

    // try-with-resources：自动关闭流，不需要手动 br.close()
    try (BufferedReader br = new BufferedReader(new FileReader("scores.txt"))) {

    String line;
    while ((line = br.readLine()) != null) {
    try {
    sum += Integer.parseInt(line.trim());
    count++;
} catch (NumberFormatException e) {
    // 处理数字格式错误
    System.out.println("跳过无效数据：" + line);
}
}

if (count > 0) {
    double average = (double) sum / count;
    System.out.println("总分：" + sum);
    System.out.println("人数：" + count);
    System.out.printf("平均分：%.2f%n", average);
} else {
    System.out.println("文件中没有有效成绩。");
}

} catch (FileNotFoundException e) {
    // 处理文件不存在
    System.out.println("错误：找不到文件 scores.txt，请检查路径。");
} catch (IOException e) {
    // 处理读取错误
    System.out.println("错误：读取文件时发生异常：" + e.getMessage());
}
}
}