Write a program that will predict the size of a population of organisms. The pro

Question

Write a program that will predict the size of a population of organisms. The program should ask for the starting number of organisms, their average daily population increase (as a percentage), and the number of days they will multiply. For example, a population might begin with two organisms, have an average daily increase of 50 percent, and will be allowed to multiply for seven days. The program should use a loop to display the size of the population for each day. So for the previous example, the output should look like: Day Organisms ----------------------------- 1 2.0 2 3.0 3 4.5 4 6.75 5 10.125 6 15.1875 7 22.78125 Input validation: Do not accept a number less than 2 for the staring size of the population. Do not accept a negative number for average percent daily population increase. Do not accept a number less than 1 for the number of days they will multiply.

Explanation / Answer

import java.util.Scanner;

import java.text.DecimalFormat;

import javax.swing.JOptionPane;

public class Population

{

public static void main(String[] args)

{

Scanner input = new Scanner(System.in);

DecimalFormat formatter = new DecimalFormat("###,###,###,###,###.00");

int startingNumberOfOrganism = 0, daysOverMultiplying = 0;

double averageDailyPopulationIncrease, dailyPopulation, percentIncrease;

System.out.println("What is the starting number of organisms?");

startingNumberOfOrganism = input.nextInt();

while(startingNumberOfOrganism < 2)

{

System.out.println("Invalid Input, enter number greater than 2");

System.out.println("What is the starting number of organisms?");

startingNumberOfOrganism = input.nextInt();

}

System.out.println("What is the average daily population increase?(provide integer number, ie 50 for %50:");

averageDailyPopulationIncrease = input.nextInt();

while(averageDailyPopulationIncrease < 2)

{

System.out.println("Invalid Input, enter an integer greater than one");

System.out.println("What is the average daily population increase?(provide decimal number, ie 50 for %50:");

averageDailyPopulationIncrease = input.nextDouble();

}

System.out.println("Population Increase will occur over how many days?");

daysOverMultiplying = input.nextInt();

while(daysOverMultiplying < 1)

{

System.out.println("Invalid Input, must enter at least a day!!");

System.out.println("Population Increase will occur over how many days??");

daysOverMultiplying = input.nextInt();

}

System.out.println("Here are the results:");

System.out.println("Days                             Number Of Organism" );

System.out.println("------------------------------" );

int day = 0;

dailyPopulation = startingNumberOfOrganism;

percentIncrease = averageDailyPopulationIncrease/100;

for(int x = 1; x <= daysOverMultiplying; x++)

{

day++;

if(day > 1)

{

dailyPopulation += (percentIncrease * dailyPopulation);

System.out.println(day + "             " + formatter.format(dailyPopulation));

}

else

{

System.out.println(day + "             " + formatter.format(dailyPopulation));

}

}

}

}

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