public class Ratuski_Nicholas_A5Q1 { /* * PURPOSE: calculate population change */ //Count between start and end public static int countInRange(String text, char start, char end) { char[] textArray = text.toCharArray(); //Convert the string to an array int count; //How much in range? count = 0; for (int i=0;i<textArray.length;i++) { if (((int)textArray[i] >= (int)start) && ((int)textArray[i] <= (int)end)) { count++; } } return count; } //Count between start and end public static long[] readLongData(int years, int start) { String temp; int numDigits; int startYear; long[] yearArray = new long[years]; for (int i=0; i<yearArray.length; i++) { yearArray[i] = start + i; temp = JOptionPane.showInputDialog ("Enter the population for year " + (start+i)); numDigits = countInRange(temp,'0','9'); while (numDigits < temp.length()) { temp = JOptionPane.showInputDialog ("Enter the population for " + (start+i)); numDigits = countInRange(temp,'0','9'); } yearArray[i] = Long.parseLong(temp); System.out.println(yearArray[i]); } return yearArray; } public static double[] findChanges( long[] yearArray ) { double[] percentChange = new double[yearArray.length - 1]; for (int i=1; i<yearArray.length; i++) { percentChange[i-1] = (double)((yearArray[i] - yearArray[i-1])/yearArray[i-1]) * 100.0; System.out.println("VALUES FOR SLOT "+i+": initial: "+yearArray[i-1]+" final: "+yearArray[i]+" percent change: "+percentChange[i-1]); } return percentChange; } public static String getSpaces(int spaces) { String line; line = " "; for (int i=0; i<spaces; i++) { line = line + " "; } return line; } public static void printTable( double[] popChange, String name, int year ) { int numStars,numSpaces; String stars; numSpaces = 20; //default amount of spaces. System.out.println("Population change in "+name+": ("+year+" - "+(year+popChange.length)+").\n"); System.out.println("year| |"); for (int i=0; i<popChange.length; i++) { numStars = (int) popChange[i]; stars = ""; for (int j=0; j<numStars; j++) { stars = stars+"*"; } if (numStars < 0) { numSpaces += numStars; System.out.println((year+i)+"|"+getSpaces(numSpaces)+stars+"|"); } else if (numStars > 0) { numSpaces = numSpaces - numStars; System.out.println((year+i)+"|"+getSpaces(20)+"|"+stars+getSpaces(numSpaces)); } else { System.out.println((year+i)+"|"+getSpaces(20)+"|"); } } } public static void main (String [] args) { String temp; //temporary input string String name; //city name int numCities; //how many cities to work with? int numYears; //amount of years int startYear; //year to start at long[] yearArray; //array of years double[] percentArray; //array of percent changes numCities = 1; temp = JOptionPane.showInputDialog ("Enter how many cities you want to calculate the population changes for."); numCities = Integer.parseInt(temp); for (int i=0; i<numCities; i++) { temp = JOptionPane.showInputDialog ("Enter the name of the city."); name = temp; temp = JOptionPane.showInputDialog ("Enter the number of years."); numYears = Integer.parseInt(temp); temp = JOptionPane.showInputDialog ("Enter the starting year. (eg. 1989)"); startYear = Integer.parseInt(temp); yearArray = readLongData(numYears, startYear); percentArray = findChanges(yearArray); printTable(percentArray, name, startYear); } System.out.println("\n\nProgrammed by Nick Ratuski"); System.out.println("Date: Saturday, November 17"); }}