15. Population Data If you have downloaded this book\'s source code (the compani

Question

15. Population Data If you have downloaded this book's source code (the companion website is available at www.pearsonhighered.com/gaddis), you will find a file named USPopulation.txt in the Chapter 7 folder. The file contains the midyear population of the United States, in thou- sands, during the years 1950 to 1990. The first line in the file contains the population for 1950, the second line contains the population for 1951, and so forth. Write a program that reads the file's contents into an array, or an ArrayList. The program should display the following data . The average annual change in population during the time period . The year with the greatest increase in population during the time period . The year with the smallest increase in population during the time period

Explanation / Answer

public class PopulationUSA

{

public static void main(String[] args) throws IOException

{

final int ARRAY_SIZE = 50;

int[] population = new int[ARRAY_SIZE];

int i,total = 0;

int populationAvg;

File file = new File("USPopulation.txt");

Scanner inputFile = new Scanner(file);

while (inputFile.hasNext() && i < population.length)

{

population[i] = inputFile.nextInt();

total += population[i];

i++;

}

populationAvg = total / population.length;

System.out.println("The Average annual change in population is: " + populationAvg);

inputFile.close();

}

}

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