Question

我正在尝试从单独的数组中获取值并执行分区数学运算。我已经创建了一个执行除法的方法，但我一直得到“坏操作数......”错误。我搜索和搜索，但找不到解决方案。我需要能够从tripMiles获取值并将其除以加仑值。

import java.util.Scanner;

public class Week6Challenge {    
    public static void main(String[] args) {
        Scanner scan = new Scanner (System.in);
        int count = 0;
        //double miles = 0, gallons = 0;
        //Arrays
        String[] tripName;
        tripName = new String[11];
        double[] tripMiles;
        tripMiles = new double[11];
        double[] tripMPG;
        tripMPG = new double [11];
        double[] gallons;
        gallons = new double [11];

        //double miles = 0, gallons = 0;

        while (count <= 9){//start while
            System.out.println("Enter a description of this trip");
            tripName[count] = scan.next();

            System.out.println("How many miles did you drive?");
            tripMiles[count] = scan.nextDouble();

            System.out.println("How many gallons of gas did you use on this trip");
            gallons[count] = scan.nextDouble();
            count++;
        }//end while

        tripMPG[count] = answer(tripMiles, gallons);

        System.out.println("Trip Name \t Miles Traveled \t MPG");
        int k = 0;
        for(k = 0; k < 10; k++){
            System.out.println(tripName[k]+ "\t\t" + tripMiles[k] + "\t\t\t" + tripMPG[k]);
        }
    }
    public static double answer(double[] num1, double[] num2){
        return (num1/num2);
    }
}

Answer 1

你试图划分两个数组，如：

return (num1/num2);

哪个无效。

相反，如果您需要两个数组的长度或总和然后除以，您可以将所有元素相加，然后除以这两个值。

Answer 2

你不能像这样(num1/num2)

分割数组

一种方法的代码片段如何进行arraya的划分

public static double answer(double[] num1, double[] num2){
   //assumimg both array is of equal length
   for (int i=0;i<num1.length;i++){
 double result = num1[i]/num2[i];
}

    }

Answer 3

正如已经提到的，你不能将数组彼此分开，而是将它们的元素分开。

更改你的答案函数，而不是两个double数组，它需要两个double并返回结果：

//num1 & num2 are double, not array
public static double answer(double num1, double num2){
    return (num1/num2);
}

在while循环后从右侧删除tripMPG[count] = answer(tripMiles, gallons);，然后在count++;之前的while循环结束处添加以下行：

tripMPG[count] = answer(tripMiles[count], gallons[count]);

所以你的时间应该是这样的：

while (count <= 9){//start while
    System.out.println("Enter a description of this trip");
    tripName[count] = scan.next();

    System.out.println("How many miles did you drive?");
    tripMiles[count] = scan.nextDouble();

    System.out.println("How many gallons of gas did you use on this trip");
    gallons[count] = scan.nextDouble();

    tripMPG[count] = answer(tripMiles[count], gallons[count]);
    count++;
}//end while

将一个数组中的值除以单独数组中的值

3 个答案: