Tip Calc

/** * This calculates the tip. * * @Zman * @1.0 */ import java.util.*; import java.lang.Integer.*; import java.lang.Double.*; public class TipCalculator { public static void main(String[] args) { Scanner s = new Scanner(System.in); //initializing variables String billS = ""; //variables with an S at the end are the String versions (user inputted) String tipPercentS = ""; //need a String to check if it's a number in method String peopleS = ""; String choiceS = ""; int people = 0; double bill = 0.0; double tipPercent = 0.0; double tip = 0.0; double total = 0.0; double splitBill = 0.0; int choice = 1; while (choice == 1) { //while loop to play again or not System.out.print("Enter the value of the bill (don't enter the dollar sign): "); //prompts for bill billS = s.nextLine(); while (!checkIfStringIsDouble(billS)) { //checks if bill price inputted is a double System.out.print("That is not a valid answer. Enter the value of the bill (don't enter the dollar sign): "); //re-prompts for bill billS = s.nextLine(); } System.out.print("Enter the percentage you would like to tip (don't enter the percent sign): "); //prompts for tip percentage tipPercentS = s.nextLine(); while (!checkIfStringIsDouble(tipPercentS)) { //checks if percent inputted is a double System.out.print("That is not a valid answer. Enter the percentage you would like to tip (don't enter the percent sign): "); //re-prompts for tip tipPercentS = s.nextLine(); } bill = Double.parseDouble(billS); //converts string input to a double tipPercent = Double.parseDouble(tipPercentS); tip = (tipPercent/100) * bill; //calculates tip tip = Math.round(tip * 100.0)/100.0; //rounds tip (if needed) total = tip + bill; System.out.println("The tip is $" + tip + "."); //outputs tip System.out.println("The total price of the bill is $" + total + "."); //outputs total price System.out.print("Enter the number of people you're splitting the bill with: "); peopleS = s.nextLine(); while (!checkIfStringIsInt(peopleS)) { //checks if number of people inputted is an int System.out.print("That is not a valid answer. Enter the number of people you're splitting the bill with: "); peopleS = s.nextLine(); } people = Integer.parseInt(peopleS); splitBill = total/people; splitBill = Math.round(splitBill * 100.0)/100.0; //rounds the bill to the nearest hundreth System.out.println("Each person has to pay $" + splitBill + "."); System.out.print("Would you like to calculate another tip? Enter 1 to do it again, enter 2 to stop: "); //keep going feature choiceS = s.nextLine(); while (!choiceS.equals("1") && !choiceS.equals("2")) { //checks if the user input is a one or a two System.out.print("That is not a valid answer. Would you like to calculate another tip? Enter 1 to do it again, enter 2 to stop: "); choiceS = s.nextLine(); } choice = Integer.parseInt(choiceS); } System.out.println("Program terminated."); } public static boolean checkIfStringIsDouble(String s) { try { Double.parseDouble(s); } catch (Exception e) { //evaluates to false if not a Double return false; } return true; } public static boolean checkIfStringIsInt(String s) { try { Integer.parseInt(s); } catch (NumberFormatException e) { //evaluates to false if not an Int return false; } return true; } }