在Java循环中更新总数

我在每次循环运行时更新总数时遇到问题。我一直在使用值2，50和5来检查我的工作。总数应该是：3，4.5，6.75，10.125，15.1875，但我能得到的只是第一个总数。在Java循环中更新总数

任何帮助非常感谢！谢谢！！

这里是我的代码：

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); 
    } 

} 

}

来源

2014-01-28 user2970463

按你的逻辑，它看起来的效果就像你想通过改变startingOrganisms值作为你循环的循环。

鉴于你的输入值：2, 50 and 5，其结果是：3, 4.5, 6.75, 10.125, 15.1875，一个粗略的猜测将startingOrganisms应分配dailyTotal2

首先改变的值将改变startingOrganisms数据类型。

double startingOrganisms;

下一步将内改变其价值循环：

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

或更好，把startingOrganisms为您dailyTotal2计数器持有的更新值和增量：

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

上述两种情况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

来源

2014-01-28 17:53:55 PopoFibo

谢谢！这帮助了很多！ :) – user2970463

@ user2970463不客气 – PopoFibo

你只能得到你计算它只有一次的第一共图大业！

你应该阅读来自用户的输入，并在一个循环计算：

while(daysMultiply != -1){ // when the user wants to quit he'll enter -1, for example 
    daysMultiply = keyboard.nextInt(); 
    dailyTotal = 0; 
    dailyTotal2 = 0; 
    for (int i = 1; i<=daysMultiply; i++) 
    { 
     dailyTotal = startingOrganisms*dailyPopulation*.01; 
     dailyTotal2 = startingOrganisms + dailyTotal; 
     System.out.println("Population for day " + i + " = " + dailyTotal2); 
    } 
}

来源

2014-01-28 17:47:26 alfasin

您每天都是根据原始人口进行计算，而不是以当前人口计算。尝试调整计算中使用目前的人口十倍的增长因素：

growth = dailyTotal*dailyPopulation*.01; 
dailyTotal dailyTotal + growth;

或在一行

dailyTotal = dailyTotal + (dailyTotal*dailyPopulation*.01);

来源

2014-01-28 17:58:48 cdkMoose

在Java循环中更新总数

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