Java程序高低位游戏

Question

我是用jQuery写的，但是循环不正确，看不到错误？ 用户输入-99不会结束？ 也不计算最高和最低数字？

import java.util.Scanner;

public class LargestandSmallest
{

    public static void main (String [] args)
    {

        //Create a Scanner object for the keyboard input
        Scanner keyboard = new Scanner(System.in);

        //Declare local variable
        double number;


        //Explain what the program does
        System.out.println ("This program will ask you to enter in a series of");
        System.out.println ("numbers, and then will display the lowest and");
        System.out.println ("highest numbers, out of what you enter, until you input");
        System.out.println ("the value indicated to end the program.");


        //Have the user input a series of numbers and continue processing 
        //until the user enters -99
        System.out.println ("Please enter a number: (or -99 to end the program).");
        number = keyboard.nextDouble();

        //Display the table headings
        System.out.println ("Lowest\tHighest");
        System.out.println ("------------------");

        //Call the method to caluclate the highest and lowest numbers
        calculateLowHigh(number);
    }

    //Module called calculateTemp
    public static void calculateLowHigh(double number)
    {  

        //Declare local calculation variables
        double highestNumber = 0;
        double lowestNumber = 0;

        //Set the parameters for running the loop
        while (number != -99)
        {
            for(number = 0; number < 5; number++)
            {

                //Calculate the lowest and highest numbers entered
                if (number > highestNumber) {
                    highestNumber = number;
                }

                if (number < lowestNumber) {
                    lowestNumber = number; 
                }

            }  
        }

        //Display the results
        System.out.println (lowestNumber + "\t\t" + highestNumber);


     }

}

Answer 1

您的问题是在calculateLowHigh ，您将number变量用于两个不同的事物。 这是将用户键入的数字传递到此方法的参数； 但您也已将其用作for循环中的循环索引。 也许您应该将一个变量用于另一个目的。 更好的是，完全省去了for循环-它似乎没有任何作用。

另外， while循环应该在main而不是在calculateHighLow ，否则用户将只能输入一次数字。