while循环和整体计算

Question

我正在社区学院学习 Java 课程，我们有一项作业。该作业要求我们询问用户对 Python 的输入，计算它们的年龄和它们一生中卵子的总和。

然后它要求我们计算每个 sumOfEggs 的最终总数并打印出来供用户查看。

System.out.println(pythonID + " will lay a total of " + sumOfEggs + " eggs over her remaining lifetime of 20 years.");

我有几个问题一直在绞尽脑汁。我看了我的课本，我以前的作业，还有我的PPT，但我想不通。

当我进行第二个循环时，它并没有重新开始，它一直在 sumOfEggs & previousYearEggs.

另一个问题是我不知道如何保存输出中显示的数字

System.out.println(pythonID + " will lay a total of " + sumOfEggs + " eggs over her remaining lifetime of 20 years.");

以下是我的整个程序：

import java.util.Scanner;
import java.io.*;

public class camelCase
{
   public static void main(String[] args)
   {

      String runProgram = " ";      //declare Run Program
      String pythonID = " ";        //declare Python ID
      int pythonAge = 0;            //declrea the Python's Age
      int previousYearEggs = 0;     //declare Previous Years Eggs
      int currentYearEggs = 0;      //declare current year's eggs
      int sumOfEggs = 0;            //declare sum of eggs
      int years = 0;                //declare years
      int maxAge = 20;              //declare Age Maximum
      int minAge = 1;               //declare Age Minimum
      int overallTotal = 0;

      //create a scanner class for keyboard input
      Scanner keyboard = new Scanner(System.in);

      //Inform the user of this program's purpose
      System.out.println("This is the Python Snake Eggstimator Program.");
      System.out.println("It estimates the number of eggs that a female python will produce over a lifetime.");

      //prompt the user for input
      System.out.println("Please enter HISS if you want to run the program or STOP to quit.");
      runProgram = keyboard.nextLine();
      runProgram = runProgram.toLowerCase();

      //while loop activated when prompted to run program
      while (runProgram.equals("hiss"))
      {

         System.out.println("Please enter the Python ID.");
         pythonID = keyboard.next();

            //initialize the currentYearEggs accumulator
            currentYearEggs = 0;

            //initialize the maxAge accumulator
            maxAge = 20;

            //Prompt user to input the age of the Python
            System.out.println("Enter the Age of the Python in Years.");
            pythonAge = keyboard.nextInt();

            //Invalid Response while loop
            while (pythonAge < minAge || pythonAge > maxAge)
            {
               System.out.println("Invalid Age: Please enter a number between 1 and 20.");
               pythonAge = keyboard.nextInt();
            }

            //Table Header
            System.out.printf("%-5s%20s%20s%20s\n", "Year", "Previous Year Eggs", "Current Year Eggs", "Sum of all Eggs");

            //for loop to calculate the input 
            for (int i = pythonAge; i <= maxAge; i++)
            {
               //initialize currentYearEggs
               currentYearEggs =  35;

               //Calculation for Sum Of All Eggs
               sumOfEggs = sumOfEggs + currentYearEggs;

               //Output data
               System.out.printf("%5d%20d%20d%20d\n", i, previousYearEggs, currentYearEggs, sumOfEggs);

               //calculate the Previous Years eggs
               previousYearEggs = sumOfEggs;


            }//end for


         //output dialogue for user giving details about their input and calculations
         //prompt to restart the program
         System.out.println(pythonID + " will lay a total of " + sumOfEggs + " eggs over her remaining lifetime of 20 years.");
         System.out.println("Enter HISS if you want to run the program or STOP to quit.");
         runProgram = keyboard.next();
         runProgram = runProgram.toLowerCase();

      }//end runProgram while


      System.out.println("The sum of all eggs for all Pythons processed is "); //+ overallTotal);

   }//main

}//class

在此先感谢您的帮助！

Answer 1

When I go for a second loop, it doesn't start fresh, it keeps adding 35 to the sumOfEggs & previousYearEggs.

你在main方法的开头初始化了sumOfEggs：int sumOfEggs = 0;但是你后面没有设置为0，所以它只能对第一个[=起作用22=]。

The other issue is that I can't figure out how to save the number presented in the output

您只需将当前的 sumOfEggs 添加到您的 overallTotal:

//for loop to calculate the input 
sumOfEggs = 0;
for(int i = pythonAge; i <= maxAge; i++) {
    //initialize currentYearEggs
    currentYearEggs = 35;

    //Calculation for Sum Of All Eggs
    sumOfEggs = sumOfEggs + currentYearEggs;

    //Output data
    System.out.printf("%5d%20d%20d%20d\n", i, previousYearEggs, currentYearEggs, sumOfEggs);

    //calculate the Previous Years eggs
    previousYearEggs = sumOfEggs;


}//end for
overallTotal += sumOfEggs;

while循环和整体计算

While loop and overall calculations

java

for-loop

input

while-loop

calculation