java/w7/ScoreAverage0.java

import java.io.BufferedReader;
import java.io.FileReader;

public class ScoreAverage0 {
    public static void main(String[] args)  {
        BufferedReader br = new BufferedReader(new FileReader("score_vali.txt"));
        String line;
        int sum = 0;
        int count = 0;
        while ((line = br.readLine()) != null) {
            sum += Integer.parseInt(line);
            count++;
        }
        br.close();
        double average = (double) sum / count;
        System.out.println("Average score: " + average);
    }
}