Introduction to Java Programming编程题9.18<IO流处理>

/*
File Score.txt number of the sum and average are:
sum = 448.9
Average = 44.9
*/
/**Score.txt:
-------------------------------------------------
33.5 88 72 25 11.3
32.11 56 76 43 12
*/
import java.util.Scanner;

public class TheFileScore {
  public static void main(String[] args) throws Exception {
    java.io.File file = new java.io.File("Score.txt");
    Scanner input = new Scanner(file);

    double sumNumber = 0;
    int count = 0;
    while (input.hasNext()) {
      sumNumber += input.nextDouble();
      count++;
    }
    double average = sumNumber / count;

    System.out.println("File Score.txt number of the sum and average are: ");
    System.out.printf("sum = %.1f\n", sumNumber);
    System.out.printf("Average = %.1f\n", average);
  }
}