老师布置了一个新的作业，在旧的基础上添加几个条件，上课没搞懂现在不太清楚该怎么改。要求如下，附上之前作业写得代码：

Write a program which computes the bill for shipping a group of boxes.

Ask for the number of boxes to be shipped. For each box:
Ask for the length, width, and height
Ask for the weight
Ask for the distance to be shipped
Ask if they want regular shipping, 2-3 day ground, or next-day air

The cost of shipping each box is calculated as follows:

Regular shipping price is 50 cents per pound.
2-3 ground is $1.00 per pound and
Next-day air is $1.50 per pound
If the distance is greater than 1000 miles there is a $5 charge added onto the cost of the given box.

Print out the cost of each box as well as the total cost of all the boxes.

Add a 6% tax onto the final bill.

On the next page is a sample run.

import java.util.Scanner;

public class Program1b
{
    public static void main(String[] args)
    {
        int NUM_BOX; 
        Scanner keyboard = new Scanner(System.in);
        System.out.print("How many boxes are there? ");
        NUM_BOX = keyboard.nextInt();
        
        double[] length = new double[NUM_BOX];
        double[] width = new double[NUM_BOX];
        double[] height = new double[NUM_BOX];
        double[] weight = new double[NUM_BOX];
        double[] cost = new double[NUM_BOX];
        double finalcost;
        double total=0;
        
        System.out.print("\nEnter lengths in inches and weight in pounds.\n\n");
        
             for (int i = 0; i < NUM_BOX;i++)
            {
            do{    
            System.out.print("Box #" + (i + 1) + " length: ");
            length[i] = keyboard.nextDouble();
            }while(length[i]<=0);
            
            do{
            System.out.print("Box #" + (i + 1) + " width: ");
            width[i] = keyboard.nextDouble();
            }while(width[i]<=0);
            
            do{
            System.out.print("Box #" + (i + 1) + " height: ");
            height[i] = keyboard.nextDouble();
            }while(height[i]<=0);
            
            do{
            System.out.print("Box #" + (i + 1) + " weight: ");
            weight[i] = keyboard.nextDouble();
            }while(weight[i]<=0);
            
            if (length[i] * width[i] * height[i] <= 2000) 
                cost[i] = weight[i] * 0.5;             
            else 
                cost[i] = weight[i] * 0.75;
            
            }

            for (int i = 0; i < NUM_BOX; i++)
            {            
            total+=cost[i];
            }
            finalcost=total*1.06;
            System.out.printf("\nThe total cost is $%.2f" , finalcost);
        
    }
}

oracle如何查询多表数据

linchuanc520

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