Lab5-Final

// Program Name: Lab05
//  Purpose: Data Validation and error handling
//  Revision History
//  Revision    Date        Author      Comment
//   -         2/16/14    Colin McNeil  Initial Release
//
import java.text.NumberFormat;
import java.util.Scanner;

public class InvoiceApp
{
    public static String ValidCustomerType(String value){
        String actualType="";
        if (value.equals("r")||value.equals("c")){
            actualType=value;
        }
        else{
            System.out.println("Only customer types r or c are accepted. Try again.");
            return "false";
        }
        return actualType;
    }
    public static Double getValidSubtotal(String value){
        double actualType=0;

        try{
            actualType=Double.parseDouble(value);
            if(actualType<=0){
                System.out.println("Subtotal must be a number larger than 0.");
                return 0.0;
            }
        }
        catch(java.lang.NumberFormatException e){
            System.out.println("Subtotal must be a number larger than 0.");
            return 0.0;
        }
        return actualType;
    }
    public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        String choice = "y";
        boolean isValid = true;

        while (!choice.equalsIgnoreCase("n")&&isValid==true)
        {
            // get the customer type from the user
            Double subtotal = 0.0;
            String customerType = "";
            System.out.print("Enter customer type (r/c): ");
            customerType = sc.nextLine();

            while(ValidCustomerType(customerType).equals("false")){
                 System.out.print("Enter customer type (r/c): ");
                 customerType = sc.nextLine();
                 isValid= false;
            }
            if(!ValidCustomerType(customerType).equals("false")){
                System.out.print("Enter subtotal:   ");
                subtotal = getValidSubtotal(sc.nextLine());
                    while (subtotal<=0.0){
                         System.out.print("Enter subtotal:   ");
                         subtotal = getValidSubtotal(sc.nextLine());
                         isValid=false;
                    }
                    if (subtotal>0.0){
                        isValid=true;
                    }
            }
            // get the subtotal from the user
            if (isValid==true){
                 // get the discount percent
                 double discountPercent = 0;
                 if (customerType.equals("r"))
                 {
                     if (subtotal < 100)
                         discountPercent = 0;
                     else if (subtotal >= 100 && subtotal < 250)
                         discountPercent = .1;
                     else if (subtotal >= 250)
                         discountPercent = .2;
                 }
                 else if (customerType.equals("c"))
                 {
                     if (subtotal < 250)
                         discountPercent = .2;
                     else
                         discountPercent = .3;
                 }
                 else
                 {
                 isValid=false;
                 }
                 // calculate the discount amount and total
                 double discountAmount = subtotal * discountPercent;
                 double total = subtotal - discountAmount;
                 // format and display the results
                 NumberFormat currency = NumberFormat.getCurrencyInstance();
                 NumberFormat percent = NumberFormat.getPercentInstance();
                 System.out.println(
                         "Discount percent: " + percent.format(discountPercent) + "\n" +
                         "Discount amount:  " + currency.format(discountAmount) + "\n" +
                         "Total:            " + currency.format(total) + "\n");
            }
            // see if the user wants to continue
            System.out.print("Continue? (y/n): ");
            choice = sc.nextLine();
            System.out.println();
            isValid=true;
        }
        sc.close();
    }
}