Question

我正在针对Java进行MOOC练习36。我必须创建一个偶数和奇数计数器，但是我的偶数和非计数器显示错误的值。一切正常，期望这个计数器，我不确定为什么。

另一方面，它表示变量sum2和平均值的初始化程序'0'是多余的。我的代码仍在运行，但是为什么只对sum2和average而不是在开始时初始化为0的所有其他变量说呢？

谢谢！

public static void main(String[] args) {

    Scanner reader = new Scanner(System.in);

    //Variables
    System.out.println("Type numbers: ");
    int numbers = Integer.parseInt(reader.nextLine());
    int counter = 0;
    int sum = numbers;
    int minus = -1;
    int even = 0;
    int odd = 0;
    int sum2 = 0;
    double average = 0;

    while (numbers >= 0) {
        numbers = Integer.parseInt(reader.nextLine());
        sum+= numbers;
        counter = counter + 1;
        if (numbers % 2 == 0 ) {
            even++;
        }else {
            odd++;
        }
    }

    if (numbers == minus) {
        int sum2 = sum + 1;
        double average = (double) sum2 / counter;
        System.out.println("Thank you and see you later!");
        System.out.println("The sum is " + sum2);
        System.out.println("How many numbers: " + counter);
        System.out.println("Average: " + average);
        System.out.println("Even numbers " + even);
        System.out.println("Odd numbers " + odd);

    }
}

Answer 1

您不应该初始化numbers来读取第一行。当您这样做时，其他计数器未正确初始化。解决一个，

int numbers = 0;

对于sum2是冗余的，它是冗余的¹，因为int sum2 = sum + 1;应该是sum2 = sum + 1;（或删除{{ 1}}）。您有两个变量，名为int sum2 = 0;。与sum2和double average = (double) sum2 / counter;相同的问题是，有两个名为double average = 0;的变量。

_{¹此处冗余是有意的。}

Answer 2

这是解决方案，谢谢大家！

导入java.util.Scanner;

公共课程草案{ 公共静态void main（String [] args）{

    Scanner reader = new Scanner(System.in);

    int numbers = 0;
    int counter = 0;
    int sum = 0;
    int even = 0;
    int odd = 0;


    System.out.println("Type number: ");
        while (numbers >= 0) {
        numbers = Integer.parseInt(reader.nextLine());
        sum = sum + numbers;
        counter = counter + 1;
        if (numbers >= 0 && numbers % 2 == 0 ) {
            even++;
        }
        if (numbers >= 0 && numbers % 2 != 0) {
            odd++;
        }
        }
    if (numbers == -1) {
        int sum2 = sum + 1;
        int counter2 = counter - 1;
        double average = (double) sum2 / counter2;
        System.out.println("Thank you and see you later!");
                System.out.println("The sum is " + sum2);
                System.out.println("How many numbers: " + counter2);
                System.out.println("Average: " + average);
                System.out.println("Even numbers " + even);
                System.out.println("Odd numbers " + odd);

    }
}

}

MOOC练习36帮助：循环，记忆和结束

2 个答案: