从if语句打印出多行以进行控制台

编程问答 2022-08-11

问题描述

我需要帮助从if语句打印多行到控制台。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所得到的内容，而不会显示前三个考试成绩的结果。有人知道问题出在哪里吗？

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!");
        }
    }
}

解决方法

正如@khelwood所指出的，您将从if-else块中排除80、70、60。如果您可以提供测试数据的样本，我们将更好地了解发生了什么。

在旁注

  1. 我们通常使用if-else if -... else。（按照惯例，最后一个分支是else，除非您要有意地排除某些情况）
  2. 就像@khelwood所说的那样，平均公式是错误的。还有一件事，如果要获取小数，则应为/3.0，因为您正在此处进行3的整数除。
  3. 如果要提高可读性，请考虑封装重复的逻辑并使之可重复使用。
javajavanetbeansnetbeansnetbeans