技術標籤：# 專案java專案統計考試成績

專案 3 統計考試成績

• 請編寫一個 Java 應用程式讀入多個考試成績值，統計顯示輸入的成績個數，最低成績
  和最高成績。
  分數值在[0,100]範圍內，-999 表示結束輸入。當輸入的分數值小於 0 或大於 100 時，給
  出提示資訊要求重新輸入。參與統計的成績均為有效成績，也就是說小於 0或大於 100 或-999
  是不在統計之列的。
  資料輸入輸出的格式不做限制，你可以使用Scanner類從控制檯輸入，然後控制檯輸出；
  也可以使用 JOptionPane 類按 GUI 的方式輸入輸出。只要選擇其中任意一種即可，不要提交
  多個版本的程式。
  另外進一步統計輸出不同成績等級(A,B,C,D,F)人數的同學可以得到最多 5 分的加分。A
  

  等級為[90,100]，B 等級為[80,90)，C 等級為[70,80)，D 等級為[60,70)，F 等級為 60 以下。

• 參考程式碼：

  package ThirdProject;
  
  import java.util.Scanner;
  
  public class LuoYu_3 {
      public static void main(String[] args) {
          System.out.print("Enter grade from 0 - 100,-999 to stop:");
          Scanner input = new Scanner(System.in)
   
  ;
          int number;
          int min = (int)1e9;
          int max = -1;
          int count = 0,countOfA = 0,countOfB = 0,countOfC = 0,countOfD = 0,countOfF = 0;
          while ((number = input.nextInt()) != -999){
              if (number > 100 || number < 0) {
                  System.out.println("Error: That is not a valid score."
   
  );
                  System.out.print("Enter grade from 0 - 100,-999 to stop:");
                  continue;
              }
              count++;
              if (number > max)
                  max = number;
              if (number < min)
                  min = number;
              if (number >= 90)
                  countOfA++;
              if (number >= 80 && number < 90)
                  countOfB++;
              if (number >= 70 && number < 80)
                  countOfC++;
              if (number >= 60 && number < 70)
                  countOfD++;
              if (number < 60)
                  countOfF++;
              System.out.print("Enter grade from 0 - 100,-999 to stop:");
          }
          System.out.println();
          System.out.println("Number of grades entered:" + count);
          System.out.println("Highest grade entered:" + max);
          System.out.println("Lowest grade entered:" + min);
          System.out.println();
          System.out.println("As: " + countOfA);
          System.out.println("Bs: " + countOfB);
          System.out.println("Cs: " + countOfC);
          System.out.println("Ds: " + countOfD);
          System.out.println("Fs: " + countOfF);
      }
  }
  
  

• 顯示結果：

  Enter grade from 0 - 100,-999 to stop:39
  Enter grade from 0 - 100,-999 to stop:80
  Enter grade from 0 - 100,-999 to stop:82
  Enter grade from 0 - 100,-999 to stop:88
  Enter grade from 0 - 100,-999 to stop:91
  Enter grade from 0 - 100,-999 to stop:99
  Enter grade from 0 - 100,-999 to stop:100
  Enter grade from 0 - 100,-999 to stop:0
  Enter grade from 0 - 100,-999 to stop:-2
  Error: That is not a valid score.
  Enter grade from 0 - 100,-999 to stop:101
  Error: That is not a valid score.
  Enter grade from 0 - 100,-999 to stop:62
  Enter grade from 0 - 100,-999 to stop:-999
  
  Number of grades entered:9
  Highest grade entered:100
  Lowest grade entered:0
  
  As: 3
  Bs: 3
  Cs: 0
  Ds: 1
  Fs: 2
  
  Process finished with exit code 0