package week_2; import static input.InputUtils. doubleInput ; /** * Customers of

Question

 package week_2;  import static input.InputUtils.doubleInput;  /**  * Customers of a heating utility company have much larger bills in the cold winter than in the summer.  * The utility company allows customers to spread the cost of bills through the year by  * charging them an average payment every month.  *  * The utility company averages all of the last year's bills, and uses that to estimate the  * average payment for next year.  *  * Ask the user for each month's bill for last year.  * Store this data in an array.  * Store January's bill in element 0, February's in element 1...  *  * Then, add up all of the bills and figure out, and display the average;  *  * Also, display the user's data in a table of months and bill amount, so they can review it for accuracy.  *  * Tip: use the months array provided, with the names of the months, to help ask for data/display data.   */   public class Question_5_Average_Utility_Bill {      String[] months = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };      public static void main(String[] args) {          // You don't need to modify this method.                  Question_5_Average_Utility_Bill billsAverage = new Question_5_Average_Utility_Bill();         billsAverage.billAverages();      }      private void billAverages() {          // You don't need to modify this method                  double[] bills = getYearBills();          double average = averageBillAmount(bills);          System.out.println(String.format("Your average bill is %.2f", average));          printBillTable(bills);      }      public double[] getYearBills() {          // TODO ask user for bill amount for January, then February...         // Create a new double array.         // Store values the user enters in this array.         // Return this array.         // Use doubleInput() to ask the user for each bill amount. A bill may be negative if the user received a credit.          return null;  // replace with your code      }       public double averageBillAmount(double[] bills) {          // TODO Calculate the average value of all the bills, and return this number.         // TODO make sure this method works with any length array.         return 0;  // replace with your code     }       public void printBillTable(double[] bills) {          // TODO display the month name, and bill amounts, in table form.         // Use the months array to display the names.           // Replace these lines with your code. You'll need to use a loop to display all the months.         // String formatting is helpful. Here's some examples to space some columns with exactly 15 character width         System.out.println(String.format("| %-15s| %-15s|", "Month", "Bill" ));         System.out.println(String.format("| %-15s| %-15.2f|", "January", 44.5995 ));       }   }

Explanation / Answer

package week_2; import static input.InputUtils.doubleInput; /** * Customers of a heating utility company have much larger bills in the cold winter than in the summer. * The utility company allows customers to spread the cost of bills through the year by * charging them an average payment every month. * * The utility company averages all of the last year's bills, and uses that to estimate the * average payment for next year. * * Ask the user for each month's bill for last year. * Store this data in an array. * Store January's bill in element 0, February's in element 1... * * Then, add up all of the bills and figure out, and display the average; * * Also, display the user's data in a table of months and bill amount, so they can review it for accuracy. * * Tip: use the months array provided, with the names of the months, to help ask for data/display data. */ public class Question_5_Average_Utility_Bill { String[] months = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" }; public static void main(String[] args) { // You don't need to modify this method. Question_5_Average_Utility_Bill billsAverage = new Question_5_Average_Utility_Bill(); billsAverage.billAverages(); } private void billAverages() { // You don't need to modify this method double[] bills = getYearBills(); double average = averageBillAmount(bills); System.out.println(String.format("Your average bill is %.2f", average)); printBillTable(bills); } public double[] getYearBills() { // TODO ask user for bill amount for January, then February... // Create a new double array. // Store values the user enters in this array. // Return this array. // Use doubleInput() to ask the user for each bill amount. A bill may be negative if the user received a credit. double bills[] = new double[12]; for(int i=0; i<12; i++) { System.out.print("Enter the bill amount for " + months[i] + ": "); bills[i] = doubleInput(); } return bills; } public double averageBillAmount(double[] bills) { double sum = 0; for(double bill: bills) { sum += bill; } return sum/bills.length; // replace with your code } public void printBillTable(double[] bills) { System.out.println(String.format("| %-15s| %-15s|", "Month", "Bill" )); for(int i=0; i<12 && i<bills.length; i++) { System.out.println(String.format("| %-15s| %-15.2f|", months[i], bills[i])); } } }

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