从 if 语句打印出多行到控制台

Question

我需要帮助将 if 语句中的多行打印到控制台。 我现在的代码在下面，但是它只会打印平均考试成绩和学生得到的成绩，而不是他们前三个考试成绩的结果。 有谁知道问题是什么？

import java.util.Scanner;

public class TestScoresAndGrade {
    public static void main(String[] args) {
        Scanner keyboard = new Scanner(System.in);
        // Gathering info from user
        System.out.println("Enter your first test score!");
        int firstScore = keyboard.nextInt();

        System.out.println("Enter your second test score!");
        int secondScore = keyboard.nextInt();

        System.out.println("Enter your third test score!");
        int thirdScore = keyboard.nextInt();
        
        int averageTestScore = (firstScore * secondScore * thirdScore)/3;
        
        // Telling the student what grade they got on the first test
        if (firstScore >= 90) {
            System.out.println("Congrats you got an A on your first test!");
        }
        else if (firstScore < 90 && firstScore > 80) {
            System.out.println("You got a B on your first test!");
        }
        else if (firstScore < 80 && firstScore > 70) {
            System.out.println("You got a C on your first test!");
        }
        else if (firstScore < 70 && firstScore > 60) {
            System.out.println("You got a D on your first test!");
        }
        else if (firstScore < 60) {
            System.out.println("You got a F on your first test!");
        }

        // Telling student what grade they got on the second test
        if (secondScore >= 90) {
            System.out.println("Congrats you got an A on your first test!");
        }
        else if (secondScore < 90 && secondScore > 80) {
            System.out.println("You got a B on your first test!");
        }
        else if (secondScore < 80 && secondScore > 70) {
            System.out.println("You got a C on your first test!");
        }
        else if (secondScore < 70 && secondScore > 60) {
            System.out.println("You got a D on your first test!");
        }
        else if (secondScore < 60) {
            System.out.println("You got a F on your first test!");
        }

        // Telling student what they got on third test
        if (thirdScore >= 90) {
            System.out.println("Congrats you got an A on your third test!");
        }
        else if (thirdScore < 90 && thirdScore > 80) {
            System.out.println("You got a B on your third test!");
        }
        else if (thirdScore < 80 && thirdScore > 70) {
            System.out.println("You got a C on your third test!");
        } 
        else if (thirdScore < 70 && thirdScore > 60) {
            System.out.println("You got a D on your third test!");
        }
        else if (thirdScore < 60) {
            System.out.println("You got a F on your third test!");
        }
        
        //Telling a student what there average score was    
        if (averageTestScore >= 90) {
            System.out.println("Congrats your avergage is an A!");
        }
        else if (averageTestScore < 90 && averageTestScore > 80) {
            System.out.println("Your average is a B!");
        }
        else if (averageTestScore < 80 && averageTestScore > 70) {
            System.out.println("Your average is a C!");
        }
        else if (averageTestScore < 70 && averageTestScore > 60) {
            System.out.println("Your average is a D!");
        }
        else if (averageTestScore < 60) {
            System.out.println("Your average is an F!");
        }
    }
}

Answer 1

正如@khelwood 指出的那样，您从 if-else 块中排除了 80、70、60。 如果您可以提供测试数据的样本，我们将更好地了解正在发生的事情。

附带说明一下，

1. 我们通常做 if-else if-...else.（按照惯例，最后一个分支是 else，除非你想故意遗漏一些情况）
2. 就像@khelwood 所说，平均公式是错误的。 还有一件事，如果你想得到十进制，你应该 /3.0，因为你在这里做整数除以 3。
3. 如果要提高可读性，可以考虑将重复的逻辑封装起来，使其可重用。