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Thread: need help with writing this program

  1. #1
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    Default need help with writing this program

    1 Create a java file in NetBeans, name it Catalog.java.
    2 Create one String array to store 3 products for a catalogue
    3 Create the appropriate variables to store the product name, product code and product price.
    4 At the start of the program display the catalogue for the user by looping through the array and outputting it to the screen with a number listing for each product, as shown above
    5 Create an infinite loop to enter orders; to stop the loop the user should enter 0.
    6 Keep a running total (accumulator) of all products amount total and sub-total (multiple accumulators)
    7 Write a method to calculate the taxes and return a grand total
    8 Write another method to print out the order as listed above

    hadda look like this

    Our catalogue [Product Codes in brackets]:

    (1) Condensed Milk [M3487], $9.50 per can.
    (2) Distilled Water [W3876], $3.00 a bottle.
    (3) Pack Rice [R9983], $12.75 for 5lbs.
    Buy something!

    Enter Order Number (0 to stop): M3487
    Enter Quantity: 2
    Enter Order Number (0 to stop): W3876
    Enter Quantity: 3
    Enter Order Number (0 to stop): R9983
    Enter Quantity: 3
    Enter Order Number (0 to stop): 0

    --- Update ---

    this is the code i have so far

    its not entering the if statement...can anyone help??
    package catalog;
     
    import java.util.*;
     
    public class Catalog {
     
       static String products[] = new String[3];
       static int answer;
     
        public static void main(String[] args) {
     
                 System.out.println("------------------");
                 System.out.println("Shopping Catalog");
                 System.out.println("------------------");
     
                  String[] pCode = new String[3];
                  float pPrice[] = new float[3];
                  int orderNum = 0;
                  int quantity=0;
     
                 Scanner s = new Scanner(System.in);
                 System.out.println("------------------------------------------");
                    System.out.println("condensed milk [M3487], $9.50 per can.");
                        System.out.println("");
                    System.out.println("Distilled Water [W3876], $3.00 a bottle.");
                        System.out.println("");
                    System.out.println("Pack Rice [R9983], $12.75 for 5lbs.");
                 System.out.println("------------------------------------------");
     
     
     
     
                    do{
     
                             System.out.println("Please enter order number (0 to stop)");
                                        pCode[orderNum] = s.nextLine();
     
                                                if(pCode[orderNum] == "M3487"){
                                                    System.out.println("condensed milk $9.50");
                                                        System.out.println("Enter Quantity");
                                                            quantity = s.nextInt();
                                                }//close if statement
                                                orderNum++;
                         if(answer == 0){
                             break;
                         }//close if
                    }while(true);//close while loop
     
        }//close main method
     
    }//close class
    Last edited by nickans; May 5th, 2014 at 07:42 AM.


  2. #2
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    Default Re: need help with writing this program

    I think if(pCode[orderNum] == "M3487") is the if statement you are talking about.
    The reason is pCode[0] - pCode[n] has a value of "null" (String "null" not null pointer).
    why? because you never declare the value of each element. you just declared an array of String.

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    Default Re: need help with writing this program

    nickans, you've been asked: Please post your code correctly. If uncertain how, please review this link.

  4. #4
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    Default Re: need help with writing this program

    [QUOTE=nickans;147057]1 Create a java file in NetBeans, name it Catalog.java.
    2 Create one String array to store 3 products for a catalogue
    3 Create the appropriate variables to store the product name, product code and product price.
    4 At the start of the program display the catalogue for the user by looping through the array and outputting it to the screen with a number listing for each product, as shown above
    5 Create an infinite loop to enter orders; to stop the loop the user should enter 0.
    6 Keep a running total (accumulator) of all products amount total and sub-total (multiple accumulators)
    7 Write a method to calculate the taxes and return a grand total
    8 Write another method to print out the order as listed above

    hadda look like this

    Our catalogue [Product Codes in brackets]:

    (1) Condensed Milk [M3487], $9.50 per can.
    (2) Distilled Water [W3876], $3.00 a bottle.
    (3) Pack Rice [R9983], $12.75 for 5lbs.
    Buy something!

    Enter Order Number (0 to stop): M3487
    Enter Quantity: 2
    Enter Order Number (0 to stop): W3876
    Enter Quantity: 3
    Enter Order Number (0 to stop): R9983
    Enter Quantity: 3
    Enter Order Number (0 to stop): 0

    --- Update ---

    this is the code i have so far

    its not entering the if statement...can anyone help??
    package catalog;
     
    import java.util.*;
     
    public class Catalog {
     
       static String products[] = new String[3];
       static int answer;
     
        public static void main(String[] args) {
     
                 System.out.println("------------------");
                 System.out.println("Shopping Catalog");
                 System.out.println("------------------");
     
                  String[] pCode = new String[3];
                  float pPrice[] = new float[3];
                  int orderNum = 0;
                  int quantity=0;
     
                 Scanner s = new Scanner(System.in);
                 System.out.println("------------------------------------------");
                    System.out.println("condensed milk [M3487], $9.50 per can.");
                        System.out.println("");
                    System.out.println("Distilled Water [W3876], $3.00 a bottle.");
                        System.out.println("");
                    System.out.println("Pack Rice [R9983], $12.75 for 5lbs.");
                 System.out.println("------------------------------------------");
     
     
     
     
                    do{
     
                             System.out.println("Please enter order number (0 to stop)");
                                        pCode[orderNum] = s.nextLine();
     
                                                if(pCode[orderNum] == "M3487"){
                                                    System.out.println("condensed milk $9.50");
                                                        System.out.println("Enter Quantity");
                                                            quantity = s.nextInt();
                                                }//close if statement
                                                orderNum++;
                         if(answer == 0){
                             break;
                         }//close if
                    }while(true);//close while loop
     
        }//close main method
     
    }//close class

  5. #5
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    Default Re: need help with writing this program

    Wasn't this answer provided in your other thread? Have you lost track, or am I remembering incorrectly? Multiple threads on the same topic end up wasting time and causing confusion so are discouraged.

  6. #6
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    Default Re: need help with writing this program

    yes it was, the other thread was solved. i'm confused as to where should i go from here. That's why i posted it here with additional information

  7. #7
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    Default Re: need help with writing this program

    so i've gotten this far, but i cant get a grand total. can anyone help with it??

     
    package catalog;
     
     
    import java.util.*;
    public class Catalog1 {
        private static final String[] products = new String[3];
       private static float total=0.0f; 
       private static final float tax = 15/100;
       private static final float[] subTotal = new float[3];
       private static final float[] itemTotal = new float[3];
       private static final double[]pPrice = new double[3];
       private static String []pCode = new String[10];
        public static void main(String[] args) {
                products[0] = "Condensed Milk"; 
                 products[1] = "Distilled Water";
                 products[2] = "Packed rice";
                 pPrice[0] = (9.50);
                 pPrice[1] = (3.00);
                 pPrice[2] = (12.75);
                int quantity = 0;
                int orderNum = 0;
             Scanner s = new Scanner(System.in);  
     
     
     
                 do{ 
                        System.out.println("------------------------------------------");
                        System.out.println("condensed Milk[M3487], $9.50 per can.");
                        System.out.println("");
                        System.out.println("Distilled Water [W3876], $3.00 a bottle.");
                        System.out.println("");
                        System.out.println("packed Rice [R9983], $12.75 for 5lbs.");
                        System.out.println("------------------------------------------");
     
                             System.out.println("Please enter order number (0 to stop)");
                                        pCode[orderNum] = s.nextLine();
     
                                                if(pCode[orderNum].equals("M3487")){
                                                    System.out.println("condensed Milk $9.50");
                                                        System.out.println("Enter Quantity");
                                                            quantity = s.nextInt();
                                                               itemTotal[0] = (float) (pPrice[0]*quantity); 
                                         System.out.println(quantity + " condensed Milk @ $9.50 = $" + itemTotal[0]);
     
                                                }else if(pCode[orderNum].equals("W3876")){
                                                     System.out.println("Distilled Water $3.00");
                                                        System.out.println("Enter Quantity");
                                                            quantity = s.nextInt();
                                                                itemTotal[1] = (float) (pPrice[1] * quantity);
                                            System.out.println(quantity +" Distilled Water @ 3.00 = $" + pPrice[1]*quantity);
     
                                                }else if(pCode[orderNum].equals("R9983")){
                                                     System.out.println("packed Rice $12.75");
                                                       System.out.println("Enter Quantity");
                                                           quantity = s.nextInt();
                                                                itemTotal[2] = (float) (pPrice[2] * quantity);
                                             System.out.println(quantity +" Distilled Water @ 3.00 = $" + pPrice[2]*quantity);
     
                                                    }else if(pCode[orderNum].equals("0")){
                                                        System.out.println("your total bill is $" + total);
                                                        break;
                                                    }//close if statement
                                                orderNum++;
                                                quantity++;
     
     
                    }while(true);//close while loop
     
        }
        public static float totalBill() {
     
     
                   subTotal[0] = itemTotal[0] * tax;
                   total = subTotal[0] + subTotal[1] + subTotal[2] + itemTotal[0] + itemTotal[1] + itemTotal[2];
    		return total ; 
     
    	}//close bill method
    }

  8. #8
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    Default Re: need help with writing this program

    What terms are included in the grand total? Once you've determined the answer to that, add those terms together and print them in a statement as the Grand Total = result.

  9. #9
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    Default Re: need help with writing this program

    i got it.. problem was that i wasn't calling it in main. but a new problem arrived, after i enter the product code and quantity, the menu appears twice.

  10. #10
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    Default Re: need help with writing this program

    So the logic to leave whatever loop the code is in at the time isn't working. Review that logic and fix it.

    There's probably a better way than a do/while( true ) loop to present the menu. I'm mostly prejudiced agains while ( true ) loops of any kind, so if it's working for you, ignore me. But there's a better way.

  11. #11
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    Default Re: need help with writing this program

    instead of the while(true)..what would u use??

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    Default Re: need help with writing this program

    A deterministic approach that applies logic rather than accepting a default result that must be broken out of.

  13. #13
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    Default Re: need help with writing this program

    having it in an infinite loop was within the specification of the assignment.

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