Thread: 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

It worked! Thank you so much.

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.