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Thread: Calculator help.

  1. #1
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    Default Calculator help.

    I am new to java, only been taking class for 1 month and i have to come up with this programme.
    Can anyone please help me please? it stand 20% and i've been cracking my head for serveral nights.
    Really please any kind soul out there please .

    A possible run of the programme.

    *****Shopping Expenditure Calculator****
    1.Calculate Shopping Expenditure
    2.Display Total Expenditure
    3.Exit
    ****************************************

    Please Enter Your Choice : 1

    Please Enter Number of Items You Bought: 2

    Please ener detials for item 1
    ===================================
    Item 1's Description is :Trousers
    Cost per item is :$56.80
    Please enter quantity bought :1
    Please confirm <Y/N> :n



    Please ener detials for item 1
    ===================================
    Item 1's Description is :Belt
    Cost per item is :$30.55
    Please enter quantity bought :1
    Please confirm <Y/N> :Y
    Cost for item 1 is = >>>$30.55<<<

    Please ener detials for item 2
    ===================================
    Item 1's Description is :Shirts
    Cost per item is :$21.50
    Please enter quantity bought :1
    Please confirm <Y/N> :y
    Cost for item 2 is = >>>$21.50<<<

    *****Shopping Expenditure Calculator****
    1.Calculate Shopping Expenditure
    2.Display Total Expenditure
    3.Exit
    ****************************************

    Please Enter Your Choice : 1

    Please Enter Number of Items You Bought: 1

    Please ener detials for item 3
    ===================================
    Item 1's Description is :Table
    Cost per item is :$125
    Please enter quantity bought :1
    Please confirm <Y/N> :y
    Cost for item 2 is = >>>$125.00<<<


    *****Shopping Expenditure Calculator****
    1.Calculate Shopping Expenditure
    2.Display Total Expenditure
    3.Exit
    ****************************************

    Please Enter Your Choice : 2

    Display Item's Individual Cost & Total Cost
    =============================================
    Cost of item 1 Belt is: $30.55
    Cost of item 1 Shirts is: $21.50
    Cost of item 1 Table is: $125.00

    Total Expenditure is = >>> $177.05<<<

    *****Shopping Expenditure Calculator****
    1.Calculate Shopping Expenditure
    2.Display Total Expenditure
    3.Exit
    ****************************************

    Please Enter Your Choice : 3

    Thank you for using Shopping Expenditure Calculator.
    Bye
    Press any key to continure...


    methods include:
    *atleast one static method other than main()
    *must have int,double,string inputs
    *selection (switch-case or if-else)
    *give error message if theres any wrong entry.
    *minimum array size of 10


    I really really really really appreciate if anyone is able to help me.
    I give my thanks.


  2. #2
    mmm.. coffee JavaPF's Avatar
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    Default Re: Calculator help.

    Hello Skinnyskinny,

    Welcome to the Java Programming Forums.

    Have you started coding any of this yet?
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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  3. #3
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    Default Re: Calculator help.

    Quote Originally Posted by JavaPF View Post
    Hello Skinnyskinny,

    Welcome to the Java Programming Forums.

    Have you started coding any of this yet?

    Ty

    I started coding but the more i do the more dead ends i come to.
    I really am giving up else i wont be turning to you guys.

  4. #4
    mmm.. coffee JavaPF's Avatar
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    Default Re: Calculator help.

    OK well seeing as this is an assignment, i'm not happy about doing all of this for you. You need to learn!!

    I have put together the basic program for you here. You will need to figure out how to add the info to the arrays & do the calculations etc..

    import java.util.Scanner;
    import java.util.ArrayList;
     
    public class ShoppingCalculator {
     
        /**
         * JavaProgrammingForums.com
         */
        static String description, yesOrNo;
        static double cost;
        static int numberOfItems, quantity;
     
        public static ArrayList<String> array = new ArrayList<String>();
     
        // Setup Scanner class for reading user input
        public static Scanner scanner = new Scanner(System.in);
        public static Scanner scanner2 = new Scanner(System.in);
     
        public static void Calculate() {
     
            System.out.println("Please Enter Number of Items You Bought: ");
            numberOfItems = scanner.nextInt();
     
            for(int a = 0; a < numberOfItems; a++){            
     
                    System.out.println("Please Enter Details For Item " + (a+1));
                    System.out.println("===================================");
     
                    System.out.println("Items Description Is: ");
                    description = scanner2.nextLine();                
     
                    System.out.println("Cost Per Item Is: ");
                    cost = scanner2.nextDouble();
     
                    System.out.println("Please Enter Quantity Bought: ");
                    quantity = scanner2.nextInt();
     
                    System.out.println("Please Confirm (y/n): ");
                    yesOrNo = scanner2.next();
     
                    if(yesOrNo.equals("y")){
                        System.out.println("You entered YES");
                        // Array code here
                    }
                    if(yesOrNo.equals("n")){
                        System.out.println("You entered NO");
                        // Possibly call Calculate method again
                    }
     
                    System.out.println("");
            }
     
        }
     
        public static void Total() {
     
            // Code to workout totals here
            System.out.println("Total");
        }
     
        public static void main(String[] args) {
     
            ShoppingCalculator sc = new ShoppingCalculator();
     
            System.out.println("*****Shopping Expenditure Calculator****");
            System.out.println("1.Calculate Shopping Expenditure");
            System.out.println("2.Display Total Expenditure");
            System.out.println("3.Exit");
            System.out.println("");
            System.out.println("Please Enter Your Choice: ");
     
            while (scanner.hasNext()) {
     
                int selection = scanner.nextInt();
     
                if (selection == 1) {
                    sc.Calculate();
                } else if (selection == 2) {
                    sc.Total();
                } else if (selection == 3) {
                    scanner.close();
                    System.out.println("Thank you for using Shopping Expenditure Calculator. Bye!");
                    System.exit(0);
                }
            }
        }
     
    }
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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  5. #5
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    Default Re: Calculator help.

    thanks for offering ur help. but there are certain things i do not understand about your codes.
    I have not learn about scanner class,shouldnt input be input.nextInt();?


    This is what i've coded so far on my own. I dont know how to continue with it. Please sorry for wasting your effort before, i really appreciate it.


    ================================================== ===============
    import java.util.*;
    import java.text.*;
    public class shopcal
    {
     static String[] itemDes= new String[12];
     static double[] price= new double[12];
     static DecimalFormat fmt=new DecimalFormat("0.00");
     static Scanner input=new Scanner(System.in).useDelimiter("\r\n") ;
      public static void main(String[] args) throws Exception
      {
     
        char choice = 'x'; // dummy initialization
     
        do
         {
          System.out.println("****Shopping EXpenditure Calculator****");
          System.out.println("1. Calculate Shopping Calculator");
          System.out.println("2. Display Total Expenditure");
          System.out.println("3. Exit");
          System.out.println("***************************************");
          System.out.print("Please Enter Your Choice: ");
          choice = (char)System.in.read();
          System.in.read(); // dummy read: reads CR (carriage return)
          System.in.read(); // dummy read: reads LF (linefeed)
          System.out.print("Please Enter Number of Items You Bought: ");
          choice = (char)System.in.read();
          System.in.read(); // dummy read: reads CR (carriage return)
          System.in.read(); // dummy read: reads LF (linefeed)
          switch (choice)
          {
     
            case '1':   for (int i=0; i<2; i++)
             System.out.println("Please enter details for item 1");
               System.out.println("===============================");
               System.out.print("Item 1's Description is :  ");
               itemDes[1]=input.next();
         System.out.print("Cost per item is: ");
         price[1]=input.nextDouble();
                        break;
                        {
                        switch(select) char select='x';
                        {case 'y': 
                         case 'Y': for (int i=0; i<2; i++)
                          System.out.println("cost of item"+i);
                          break;
                        }
     
          }// end of switch-case
         } while (choice != '3'); //end of do-while loop
      } // end of main method
    }
    }

  6. #6
    Super Moderator helloworld922's Avatar
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    Default Re: Calculator help.

    I sent you a message, but i'm going to post the pseudo code here again:
    shopcal class:
    import java.util.*;
    import java.text.*;
     
     
    public class shopcal
    {
        public static void main (String[] args) throws Exception
        {
            Item[] items = new Item[100];
            DecimalFormat fmt = new DecimalFormat("0.00");
            int numItems = 0;
            while (true)
            {
                // Get the top-level menu choice
                String choice = getMenuChoice();
                if (choice.equals("1"))
                {
                    // Calculate shopping calculator choice
                    // get item description
                    String description = getItemDescription(numItems);
                    // get total item price
                    double price = getItemPrice();
                    // get the quantity of that item
                    int number = getItemQuantity();
                    // Set only if confirmation is recieved
                    if (getConfirmation())
                    {
                        // create a new item and add it
                        items[numItems] = new Item(description, price, number);
                        // TODO: increase the number of items
                    }
     
                }
                else if (choice.equals("2"))
                {
                    // display total expenditure choice
                    System.out.println("Display Item's Individual Cost & Total Cost");
                    System.out.println("=============================================");
                    for (int i = 0; i < numItems; i++)
                    {
                        // TODO: what should be printed out for each item?
                        // use items[i].(attribute goes here) to access the item's attributes
                        // ex: items[i].description gets the item's description
                    }
                }
                else if (choice.equals("3"))
                {
                    // quit choice
                    return;
                }
                else
                {
                    // invalid menu choice
                    // TODO: print out an error message if choice was not 1, 2, or 3
                }
            }
        }
     
        public static String getMenuChoice ()
        {
            Scanner input = new Scanner(System.in);
            System.out.println("****Shopping EXpenditure Calculator****");
            System.out.println("1. Calculate Shopping Calculator");
            System.out.println("2. Display Total Expenditure");
            System.out.println("3. Exit");
            System.out.println("***************************************");
            System.out.print("Please Enter Your Choice: ");
            return input.nextLine();
        }
     
        public static String getItemDescription (int itemNum)
        {
            // here's a completed example of how getting each attribute should look like
            Scanner input = new Scanner(System.in);
            System.out.println("Please ener detials for item " + itemNum);
            System.out.println("==================================");
            System.out.print("Item 1's Description is : ");
            return input.nextLine();
        }
     
        public static double getItemPrice ()
        {
            // TODO: finish this method
            Scanner input = new Scanner(System.in);
            double price = 0;
            // TODO: print out what you want to ask the user
            // TODO: read in from scanner
            // TODO: return the price (as double)
            return price;
        }
     
        public static int getItemQuantity ()
        {
            // TODO: finish this method
            Scanner input = new Scanner(System.in);
            int quantity = 0;
            // TODO: print out what you want to ask the user
            // TODO: read in from scanner
            // TODO: return the quantity (as int)
            return quantity;
        }
     
        public static boolean getConfirmation ()
        {
            // TODO: finish this method
            Scanner input = new Scanner(System.in);
            String read = "";
            // TODO: print out what you want to ask the user
            // TODO: read in from scanner
            // TODO: check to see if y/n, return appropriate true (y) or false (n)
            if (read.equals("y"))
            {
                return false;
            }
            else if (read.equals("n"))
            {
                return false;
            }
            else
            {
                // TODO: handle invalid input
                // throw an exception
                throw new RuntimeException();
            }
        }
    }
    Item class:
    public class Item
    {
        public String description;
        public int    numItems;
        public double unitCost;
     
        public Item (String description, double unitCost, int numItems)
        {
            this.description = description;
            this.unitCost = unitCost;
            this.numItems = numItems;
        }
    }

  7. #7
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    Default Re: Calculator help.

    Skinny:
    He declares the Scanner "scanner".
    So we would reffer to it by it's assigned name.
    the method scanner.nextInt(); gets user input.
    So something like this:
    System.out.println("How much are you spending");
    int spent = scanner.nextInt();

    The user would see How much are you spending,
    then input a number.
    What they input would be assigned to the int spent.

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