输出一个我不想得到的条件，可能是代码块管理不当

Question

Java 的新手，在使用积木时遇到困难，当输入 sum = 9、examGrade = 105 和 average = 105 时，输出应该仅为“错误无效数字”。

现在的输出是：

“错误号码无效”

100

100.00

不知何故进入了else条件，没能成功，先谢谢大家的帮助:)

public static void main(String[] args) {    
    Scanner input = new Scanner(System.in);
    
    int examGrade = 0, sum;
    double average = 0;
    
    System.out.println("Please enter your Exam Grade");
    examGrade = input.nextInt();
    
    System.out.println("Please enter your homework average");
    average = input.nextDouble();
    
    System.out.println("Please enter number of exercise");
    sum = input.nextInt();
    
    if (sum > 8 || examGrade > 100 || average > 100) {
        System.out.println("Error invaild numbers");
    }
    
    if (sum <= 4) {
        System.out.println("Your Final grade is zero");
    }
    
    if (sum == 5 || sum == 6) {
        if (examGrade >= 55) {
            System.out.println(examGrade*0.8 + average*0.2);
        }
    }
    else {
        System.out.println(examGrade);
    }
    
    if (sum == 7 || sum == 8) {
        if(examGrade <= 54) {
            if(average >= 80) {
                System.out.println(examGrade*0.75 + average*0.25);
            }
            else if(average < 80) {
                System.out.println(examGrade*0.8 + average*0.2);
            }
        }
    }
    else {
        System.out.println(examGrade*0.7 + average*0.3);
    }
}

Answer 1

如果您遇到“无效数字”情况，您可能不想进行所有其他检查。为此，您需要像这样将它们全部包装到 else 中：

if (sum > 8 || examGrade > 100 || average > 100 ) {
    System.out.println("Error invaild numbers");
} else {
    if (sum <= 4 ) {
        System.out.println("Your Final grade is zero");
    }
    // and so on with all the other ifs
} // finish the "not invalid" block

输出一个我不想得到的条件，可能是代码块管理不当

Outputting a condition I didn't mean to get, probably code blocks are not managed properly

java

eclipse

input

codeblocks

output