第七章第一题（指定等级）(Assign grades) – 编程练习题答案

(指定等级）编写一个程序，读入学生成绩，获取最髙分best, 然后根据下面的规则陚等级值

• 如果分数>=best-10, 等级为A

• 如果分数>=best-20, 等级为B

• 如果分数>=best-30, 等级为C

• 如果分数>=best-40, 等级为D

• 其他情况下，等级为F

程序提示用户输入学生总数，然后提示用户输入所有的分数，最后显示等级得出结论。下面

是一个运行示例：

Enter the number of students: 4
Enter 4 scores: 40 55 70 58
Student 0 score is 40 and grade is C
Student 1 score is 55 and grade is B
Student 2 score is 70 and grade is A
Student 3 score is 58 and grade is B

下面是参考答案代码:

// https://cn.fankuiba.com
import java.util.Arrays;
import java.util.Scanner;


public class Ans7_1_page235 {
    public static void main(String[] args) {
        String[] grade = {"A","B","C","D","F"};
        Scanner input = new Scanner(System.in);
        System.out.print("Enter the number of students: ");
        int number = input.nextInt();
        System.out.print("Enter " + number + " scores: ");

        int[] score = new int[number];
        for (int i = 0; i < number; i++)
            score[i] = input.nextInt();

        int[] scoreSort = new int[number];
        System.arraycopy(score,0,scoreSort,0,score.length);

        Arrays.sort(scoreSort);

        int maxSort = scoreSort[number-1];
        for (int i = 0; i < number; i++) {
            if (score[i] >= maxSort-10)
                System.out.println("Student " + i + " score is " + score[i] +
                        " and grade is " + grade[0]);
            else if (score[i] >= maxSort-20)
                System.out.println("Student " + i + " score is " + score[i] +
                        " and grade is " + grade[1]);
            else if (score[i] >= maxSort-30)
                System.out.println("Student " + i + " score is " + score[i] +
                        " and grade is " + grade[2]);
            else if (score[i] >= maxSort-40)
                System.out.println("Student " + i + " score is " + score[i] +
                        " and grade is " + grade[3]);
            else
                System.out.println("Student " + i + " score is " + score[i] +
                        " and grade is " + grade[4]);
        }
    }
}

适用Java语言程序设计与数据结构（基础篇）（原书第11版）Java语言程序设计（基础篇）（原书第10/11版）

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