1. COSC 1P02 Introduction to Computer Science 9.1 Cosc 1P02 "A lie gets halfway around the world before the truth has a chance to get its pants on.” Sir Winston Churchill (1874-1965)

2. COSC 1P02 Introduction to Computer Science 9.2 Report Generation  Most data processing involves production of a report (typically printed)  Report  header  detail lines  summary (footer)  Report format  tabular in nature  each row represents one entity (e.g. student)  similar pieces of data (e.g. mark) in a column  header has a title and a heading for each column  summary may be columnar or free-form

3. Sample Report Output

4. COSC 1P02 Introduction to Computer Science 9.4 ReportPrinter  Support for printed reports in columnar format  title for report centered at top of page  data written to field  field has a name, a label and a width  name used to specify field when writing  label forms part of heading  width is width of column  report designed by setting title and adding fields  fields added L-R across report  handles moving to next line and pagination  Methods  setting title  adding fields  writing into fields  Example  PDFCreator

5. ReportPrinter Methods

6. COSC 1P02 Introduction to Computer Science 9.6 Payroll  Simple monthly payroll for a small company  File of employee data  employee number, pay rate, year-to-date gross pay  Hours worked entered by user  Payroll report  employee number, pay rate, hours worked, gross pay, year- to-date gross pay  layout & formatting  New file of employee data  updated year-to-date gross pay  suitable for input for next month  Example  ASCIIOutputFile  tab delimited text  prompting  formatting report fields  skipping report fields

7. Pay Roll Report

8. ASCIIOutputFile Methods

9. BasicIO.Formats Methods

10. COSC 1P02 Introduction to Computer Science 9.10 Graphical User Interface (GUI)

11. COSC 1P02 Introduction to Computer Science 9.11 User Interaction  Windows with widgets to allow user interaction  Both input (data acquisition) and output (display)  BasicForm  form is a window  fields (widgets) for user interaction  button(s) to indicate user action  TurtleDisplayer, SoundPlayer, PictureDisplayer, ASCIIPrompter and ASCIIDisplayer are all BasicForm s  Fields  name  label  size  position  format

12. Loan Calculator Form

13. COSC 1P02 Introduction to Computer Science 9.13 Loan Calculator  Loan with compound interest  Payment and cost of borrowing  Formula  Form  Example  BasicForm  setting up form  adding fields  name, label, position  TextFields  size (width), format  button  OK by default  reading/writing  by field name  awaiting user interaction  accept

14. Amortization Formula

15. BasicForm Methods

16. COSC 1P02 Introduction to Computer Science 9.16 Loan Calculator Revisited  Probably want to do “what ifs”  enter/change values and recalculate  Multiple buttons to indicate user choice  Calculate, Quit  Loop until user presses Quit button  Example  multiple buttons  while loop with break  accept function method

17. COSC 1P02 Introduction to Computer Science 9.17 Mark Recorder  File of marks for student work in course  2 assignments, test and exam  Input/update data file  Forms-based application  form  load with data from file  allow user to update  write data to new file  Report  same fields as form  Example  loading/writing course information  form design  report design  read data and fill form  allow update  can skip ( Next )

18. COSC 1P02 Introduction to Computer Science 9.18 Widgets  Interaction objects that can appear on form  Buttons  displayed on accept  control interaction  Label  CheckBox  RadioButton  Slider  Sound  TextField  Canvas  TextArea

19. COSC 1P02 Introduction to Computer Science 9.19 Switch Statement  Choice between a number of alternatives based on a value  Typically used to handle user choices in GUI  E.g. button number pressed  Syntax  Execution  evaluate expression  check each case in order to see if it matches  if so, execute statements and break out of switch

20. COSC 1P02 Introduction to Computer Science 9.20 Switch Case

21. COSC 1P02 Introduction to Computer Science 9.21 Switch Examples.

22. COSC 1P02 Introduction to Computer Science 9.22 BasicForm Widgets

23. COSC 1P02 Introduction to Computer Science 9.23 The end