java - 循环不会添加总计

Question

制作一本适用于一名学生的成绩册，它以学生的姓名作为输入。然后，他们被要求将成绩分为三类:家庭作业、测验和测试。每个类别的成绩将分别进行平均，最后计算公式:“最终平均成绩 = 0.25*家庭作业平均成绩 + 0.25测验平均成绩 + 0.50测试平均成绩 = 65

一切正常，但 -1 并没有结束该过程!真令人沮丧!

import java.util.Scanner; 

public class Assignment3

{
public static void main( String[] args ) 
{ 
    Scanner input = new Scanner( System.in );

    int homeworkGrades;
    int quizGrades;
    int testGrades;
    int choice;
    int total;
    double average;
    String name;

    total = 0;
    homeworkGrades = 0;

        System.out.println( "Enter 1 or 2: \n 1 - Average grades \n 2 - Quit" ); 
        choice = input.nextInt();

        if ( choice == 1 ) {
            System.out.println( "Enter the students name" );
            name = input.next();



            System.out.println( " What would you like to do? \n 1 - Homework grades \n 2 - Quiz grades \n 3 - Test grades " );
            choice = input.nextInt();

            {

                while ( choice == 1 ) {
                    System.out.println( "Enter a homework grade. Press -1 when finished" );
                    homeworkGrades += input.nextInt();

                    if ( homeworkGrades != -1 ) //it's something going on right here :s

                    if ( homeworkGrades == -1 )
                        System.out.println("Total for homework grades is " + homeworkGrades );      
                }
            }
        }

    else if ( choice == 2 ) {
        System.out.println( "Exiting program" );
    }

    else {
        System.out.println( "Invalid response, exiting program." ); 
    }       
}

}

Answer 1

你的代码有 if ( homeworkGrades != -1 ) 紧接着是 if ( homeworkGrades == -1 ) - 这可能不会做你想要的它要做。

我建议始终在 if 语句周围加上大括号，并使用适当的代码缩进来避免此类错误 - 在通读时检测它们会变得更加容易。