java - 在Java Loop中更新Total

我在每次循环运行时都无法更新总数。
我一直在使用值2、50和5来检查我的工作。
总数应为：3、4.5、6.75、10.125和15.1875，但我所能得到的只是第一个总数。

很感谢任何形式的帮助！谢谢！！

这是我的代码：

import java.util.Scanner;

public class Population
{

public static void main(String[] args)
{
    int startingOrganisms;
    int dailyPopulation;
    int daysMultiply;
    double dailyTotal = 0;
    double dailyTotal2 = 0;
    double dailyTotal3 = 0;

    Scanner keyboard = new Scanner(System.in);

    System.out.println("Starting # of Organisms:");
    startingOrganisms = keyboard.nextInt();

    System.out.println("Daily Population Increase(%):");
    dailyPopulation = keyboard.nextInt();

    System.out.println("# of Days They'll Multiply:");
    daysMultiply = keyboard.nextInt();

    for (int i = 1; i<=daysMultiply; i++)
    {
        dailyTotal = startingOrganisms*dailyPopulation*.01;
        dailyTotal2 = startingOrganisms + dailyTotal;
        System.out.println("Population for day " + i + " = " + dailyTotal2);
    }

}

}

最佳答案

根据您的逻辑和结果，看起来您想在遍历for循环时更改startingOrganisms值。

给定您的输入值为：2, 50 and 5，结果为：3, 4.5, 6.75, 10.125, 15.1875，应该将startingOrganisms的粗略猜测设为dailyTotal2

第一个更改将更改startingOrganisms的数据类型。

double startingOrganisms;

接下来是在for循环中更改其值：

for (int i = 1; i <= daysMultiply; i++) {
            dailyTotal = startingOrganisms * dailyPopulation * .01;
            dailyTotal2 = startingOrganisms + dailyTotal;
            startingOrganisms = dailyTotal2;
            System.out.println("Population for day " + i + " = " + dailyTotal2);
        }

或者更好的方法是将startingOrganisms当作您的dailyTotal2计数器，该计数器保存更新后的值并递增：

for (int i = 1; i <= daysMultiply; i++) {
            dailyTotal = startingOrganisms * dailyPopulation * .01;
            startingOrganisms = startingOrganisms + dailyTotal;
            //startingOrganisms = dailyTotal2
            System.out.println("Population for day " + i + " = " + startingOrganisms);
        }

您在上述两种情况下得到的结果都是您所期望的：

Starting # of Organisms:
2
Daily Population Increase(%):
50
# of Days They'll Multiply:
5
Population for day 1 = 3.0
Population for day 2 = 4.5
Population for day 3 = 6.75
Population for day 4 = 10.125
Population for day 5 = 15.1875