Help on Lisp programming question.

Help! A question about programming?

• So I'm on this question and I have to do this: b) Write a Java program to calculate and print a bill of sale based on the following: - the cashier must enter in the amount of the item purchased (type in an amount less than $15) - enter the amount tendered ($20) (assume it will be larger than the purchase price, and when testing your program always enter a value greater than the tender) -calculate taxes (GST at 7%, PST at 8% calculated separately), total bill, and change -output the entire bill showing purchased price, taxes, total and change So this is what I have so far: import java.io.*; import hsa.Console; import java.awt.*; import java.text.*; public class Bill2 { public static void main (String[] args) throws IOException { String bill, tendered; DataInputStream keyboard = new DataInputStream(System.in); System.out.println("Tender: "); bill = keyboard.readLine(); System.out.println("Subtotal: " + bill); System.out.println("Amount tendered: "); tendered = keyboard.readLine(); //variable declaration int tendered, at; double t, st, g, p, gst, pst, bill; /* *at represents amount tendered *t represents the total amount *st represents the subtotal *g represents the gst percent *p represents the pst percent *gst represent the percent on tender *pst represents the percent on tender */ //variable initialization g = 0.07; p = 0.08; //calculations st = (bill * g) + (bill * p) + st; } } I don't understand what to do next ): I'm a bit confused on the whole question actually. I already know how to input colour and cursor commands so I'll do all that later, I just don't understand the question and I don't really know what I'm doing.. Thanks! :D

• Answer:

  I haven't touched Java in a long time, so I might be off in a few places. But I'll give you basic idea. Use this to set up your Reader (#1): InputStreamReader convert = new InputStreamReader(System.in); BufferedReader stdin = new BufferedReader(convert); String tempString = ""; 1. Enter amount *Purchased.* tempString = stdin.readLine(); double amountPurchased = new Double(tempString).doubleValue(); 2. Enter amount *tendered* tempString = stdin.readLine(); //Maybe use a different variable. double amountTendered = new Double(tempString).doubleValue(); 3. Calculate taxes: double GST_Tax = 1.07; double PST_Tax = 1.08; double GST_TaxTotal = (amountPurchased * GST_Tax); double PST_TaxTotal = (amountPurchased * PST_Tax); double totalWithTaxes = GST_TaxTotal + PST_TaxTotal; 4. Maybe *here* you should do some validation as to: if ( amountTendered > totalWithTaxes ) then OK else NOT OK. 5. Calculate change: double change = amountTendered - totalWithTaxes; 6. Output: System.out.println("Purchased price: " + amountPurchased); System.out.println("GST Tax: " + GST_TaxTotal); System.out.println("PST Tax: " + PST_TaxTotal); System.out.println("Total with tax: " + totalWithTaxes); System.out.println("Amount tendered: " + amountTendered); System.out.println("Change: " + change); hope this helps, and I hope my logic isn't wrong.