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Population.java
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Population.java
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/**
* Write a program that predicts the size of a population
* of organisms based on the starting number of organisms,
* the daily population increase percentage, and the number
* of days. Use a loop to display the size of the population
* for each day.
*/
import java.util.Scanner;
public class Population {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int population;
double dailyIncrease;
int days;
// Input validation for population size (minimum 2)
do {
System.out.print("Enter the starting number of organisms (minimum 2): ");
population = scanner.nextInt();
if (population < 2) {
System.out.println("The starting population must be at least 2.");
}
} while (population < 2);
// Input validation for daily population increase (non-negative)
do {
System.out.print("Enter the average daily population increase (as a percentage): ");
dailyIncrease = scanner.nextDouble();
if (dailyIncrease < 0) {
System.out.println("The daily population increase cannot be negative.");
}
} while (dailyIncrease < 0);
// Input validation for number of days (minimum 1)
do {
System.out.print("Enter the number of days they will multiply (minimum 1): ");
days = scanner.nextInt();
if (days < 1) {
System.out.println("The number of days must be at least 1.");
}
} while (days < 1);
// Display population for each day
System.out.println("\nDay\tPopulation");
System.out.println("-------------------");
for (int i = 1; i <= days; i++) {
System.out.println(i + "\t" + population);
// Increase the population by the daily percentage
population += population * (dailyIncrease / 100);
}
scanner.close();
}
}
/**
* Explanation:
The program prompts the user for the initial population,
daily population increase as a percentage, and the number
of days. Input validation ensures the population is at
least 2, the daily increase is non-negative, and the
number of days is at least 1. A loop displays the
population for each day, with the population increasing
based on the percentage input.
*/