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Thread: Help with Java program: Software Sales

  1. #1
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    Default Help with Java program: Software Sales

     import java.text.DecimalFormat;
    import java.util.Scanner;
     
    public class SoftwareSales
    {
       public static void main(String[] args)
       {
          DecimalFormat money = new DecimalFormat("#,###.00");
          final double unitPrice = 99.00;
          int units;
          double discountPercent, discount, cost;
     
          Scanner keyboard = new Scanner(System.in);
     
          //ask user enter units
          System.out.print("Enter the amount of units sold: ");
             units = keyboard.nextInt();
     
          //algorithm   
          if (units >= 100)
             {discountPercent = 0.5;}
          else if (units >= 50 && units <= 99)
             {discountPercent = 0.4;}
          else if (units >= 20 && units <= 49)
             {discountPercent = 0.3;}
          else if (units >= 10 && units <= 19)
             {discountPercent = 0.2;}
     
          discount = units * unitPrice * discountPercent;
          cost = (units * unitPrice) - discount;
     
          //display
          System.out.println("Units sold: " + units);
          System.out.println("Discount $: " + money.format(discount));
          System.out.println("Cost $: " + money.format(cost));
       }
    }

    I keep getting this error message when I compile the program:
     SoftwareSales.java:31: error: variable discountPercent might not have been initialized
          discount = units * unitPrice * discountPercent;
                                         ^
    1 error


  2. #2
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    Default Re: Help with Java program: Internet Service Provider

    Hi rosiems, your code looks okay to me. It likely, whenever you run it, your input is always below the minimum i.e. 10. So, I suggest (and this is the proper thing to do) you add a last else statement that initializes discountPercent to zero or something of your choosing.
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  3. The Following User Says Thank You to Mugambbo For This Useful Post:

    rosiems95 (February 22nd, 2014)

  4. #3
    Super Moderator Norm's Avatar
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    Default Re: Help with Java program: Internet Service Provider

    variable discountPercent might not have been initialized
    The compiler does not go through all the if conditions to see what happens there. It can not see that the variable will always be given a value. Best to give local variables values when they are defined so the compiler is satisfied.
    If you don't understand my answer, don't ignore it, ask a question.

  5. The Following User Says Thank You to Norm For This Useful Post:

    rosiems95 (February 22nd, 2014)

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    Default Re: Help with Java program: Internet Service Provider

    It worked! Thank you so much.

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    Default Re: Help with Java program: Internet Service Provider

    If you are curious, the problem would have arised when units would have been a negative integer. In this case the variable discountPercent would not have been initialized.
    Simply giving it a default value when defining the variable, or adding another "else" statement at the end of your if-then-else block would solve the problem.

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