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Programming Languages and Techniques (CIS120) Lecture 1 January 9, 2013 Course Overview and LogisDcs IntroducDon to Program Design

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Page 1: Programming)Languages)) and)Techniques) (CIS120))cis120/archive/13sp/lectures/...Philosophy • Programming) – …is fun, useful,)and)rewarding)in)its)own)right – …)is)also)aconceptual)

Programming  Languages    and  Techniques  

(CIS120)  

Lecture  1  

January  9,  2013  

Course  Overview  and  LogisDcs  IntroducDon  to  Program  Design  

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IntroducDons  

•  Instructor:  Dr.  Stephanie  Weirich*  –  Levine  Hall  510  –  [email protected]  

–  hOp://www.cis.upenn.edu/~sweirich/  

•  Course  Administrator:    Laura  Fox  –  Levine  308  –  [email protected]  

CIS120  /  Spring  2013   2  

*Pronounced  phoneDcally  as:  “why  rick”.          I  won’t  get  upset  if  you  mispronounce  my  name  (really!).    I  will  answer  to  anything  remotely  close,  or,  you  can  call  me  Stephanie  or  just  Professor.    Whatever  you  feel  comfortable  with.  

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TA  Staff*  

•  Harmony  Li  •  Patrick  Hulce  •  Noam  Zilberstein  •  Tate  Mandel  •  Lewis  Ellis  •  Max  Scheiber  •  Tiernan  Garsys  •  Connie  Yuan  •  Joe  Schaffer  •  Richard  Eisenberg  

•  Mitchell  Tang  •  Jinesh  Desai  •  Jason  Kong  •  Ian  Sibner  •  Ashu  Goel  •  Sudarshan  Mural  •  Rachel  Miao  •  Cam  Cogan  •  Ran  Chen  

CIS120  /  Spring  2013   3  

*AKA:    CIS  120  spirit  guides,  student  champions,  and  all-­‐around  defenders  of  the  universe.  

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Course  websites  

•  Web  site:  hOp://www.cis.upenn.edu/~cis120  

•  No  required  textbook.  All  materials  online.  –  Lecture  slides,  lecture  notes  –  Programming  style  guides  –  Homework  assignments,  submission,  labs,  exams  

–  Supplementary  resources    

•  Piazza:  hOp://piazza.com/class#spring2013/cis120  –  Course  discussion  group  for  quesDons,  clarificaDons,  etc.  –  Allows  anonymous  posDng  –  Allows  private  posDng,  visible  only  to  course  staff  

CIS120  /  Spring  2013   4  

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Prerequisites  

•  We  assume  you  can  already  write  10  to  100-­‐line  programs  in  some  imperaDve  or  OO  language  –  Not  necessarily  Java  or  any  other  parDcular  language,  though  Java  gives  the  best  background  

–  CIS  110  or  AP  CS  is  typical  –  But  you  should  be  familiar  with  using  a  compiler,  ediDng  code,  and  running  programs  you  have  created  

•  CIS  110  is  an  alternaDve  this  course  –  If  you  have  doubts,  come  talk  to  me  to  figure  out  the  right  course  for  you  

CIS120  /  Spring  2013   5  

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RegistraDon  

•  There  is  sDll  room  to  register  for  the  lecture  

•  Newly  added  lab  secDon:  CIS  120  209  – W  1:00-­‐2:00p  

•  If  you  wish  to  add  the  class  or  switch  lab  secDons,  contact  Jackie  Caliman    ([email protected])  

•  Go  to  lab  secDon  you  want  to  join  this  week  

CIS120  /  Spring  2013   6  

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Course  Goals  

•  Ability  to  write  larger  (~1000  lines)  programs  –  increased  independence  ("working  without  a  recipe")    

•  Fluency  in  program  design  –  test-­‐driven  programming  –  modular  decomposiDon  

–  working  with  different  programming  idioms  

•  Fluency  in  core  Java    •  Firm  grasp  of  principles  of  Computer  Science  

CIS120  /  Spring  2013   7  

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Philosophy  •  Programming  

–  …  is  fun,  useful,  and  rewarding  in  its  own  right  –  …  is  also  a  conceptual  founda1on  for  all  of  computer  science  –  …  involves  tools  that  are  oqen  large  and  complex,  for  good  reasons!  –  …  takes  lots  of  pracDce  to  master  

•  Teaching  introductory  computer  science  –  Start  with  basic  skills  of  “algorithmic  thinking”  (AP/110)  –  Develop  more  systemaDc  design  and  analysis  skills  in  the  context  of  

larger  and  more  challenging  problems  (120)  –  PracDce  with  industrial-­‐strength  tools  and  design  processes,  e.g.  Java  

(120,  121,  and  beyond)  

•  About  CIS120  –  Teach  Java  a2er  serng  up  the  context  needed  to  understand  why  Java  

and  OO  programming  are  good  tools  –  Concentrate  on  the  process  of  designing  programs  –  Give  a  taste  of  the  breadth  and  depth  of  CS  

CIS120  /  Spring  2013   8  

Plato   Aristotle   Al-­‐Kwarizmi  

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Philosophy  •  Teaching  introductory  computer  science  –  Start  with  basic  skills  of  “algorithmic  thinking”  (AP/110)  –  Develop  more  systemaDc  design  and  analysis  skills  in  the  context  of  larger  and  more  challenging  problems  (120)  

–  PracDce  with  industrial-­‐strength  tools  and  design  processes  (120,  121,  and  beyond)  

•  Role  of  CIS120  –  Concentrate  on  the  process  of  designing  programs  –  Start  with  foundaDons  of  programming  using  the  rich  grammar  and  precise  semanDcs  of  the  OCaml  language  

–  TransiDon  to  Java  a2er  serng  up  the  context  needed  to  understand  why  Java  and  OO  programming  are  good  tools  

–  Give  a  taste  of  the  breadth  and  depth  of  CS  

CIS120  /  Spring  2013   9  

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CIS  120  Tools  

•  OCaml  –  Mature  funcDonal  programming  language  –  Lightweight,  approachable  serng  for  learning  

about  program  design  –  Levels  the  playing  field  at  the  start  of  the  course  

•  Java  –  Industry-­‐standard  typed  OO  language  –  Many  tools/libraries/resources  available  

•  Eclipse  –  Popular  open-­‐source  integrated  development  

environment  (IDE)  

•  We’ll  help  you  get  these  set  up  on  your  laptops  in  lab  today  and  tomorrow  

CIS120  /  Spring  2013   10  

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Who  uses  OCaml?  

CIS120  /  Spring  2013   11  

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Why  two  languages?  

•  Pedagogic  progression  •  PerspecDve  •  Disparity  of  background  •  Confidence  in  learning  new  tools    

CIS120  /  Spring  2013   12  

“[OCaml]  made  me  beOer  understand  features  of  Java  that  seemed      innate  to  programming,  which  were  merely  abstracDons  and      assumpDons  that  Java  made.  It  made  me  a  beOer  Java  programmer.''      -­‐-­‐-­‐  Anonymous  CIS  120  Student  

“[The  OCaml  part  of  the  class]  was  very  essenDal  to      gerng  fundamental  ideas  of  comp  sci  across.  Without  the  second      language  it  is  easy  to  fall  into  rouDne  and  syntax  lock  where  you      don't  really  understand  the  bigger  picture.'’    -­‐-­‐-­‐Anonymous  CIS  120  Student    

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Course  Components  •  Lectures  

–  PresentaDon  of  ideas  and  concepts  –  InteracDve  demos  

•  RecitaDons    (6%  of  final  grade)  –  PracDce  and  discussion  in  small  group  serng  –  Grade  based  on  parDcipaDon  –  START  TODAY  

•  Homeworks    (50%  of  final  grade)  –  PracDce,  experience  with  tools  –  Exposure  to  broad  ideas  of  computer  science  –  Grade  based  on  automated  tests  +  style  

•  Exams  (44%  of  final  grade)  –  In  class,  pencil  and  paper  –  Do  you  understand  the  terminology?  Can  you  model  computaDon?  

Can  you  synthesize  soluDons?  

CIS120  /  Spring  2013   13  

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Lecture  Policy  

•  Laptops  closed…  minds  open  –  Although  this  is  a  computer  science  class,  the  use  of  laptops,  cell  phones,  mobile  devices,  iPads,  etc.,  in  lecture  is  prohibited!    

•  Why?  –  Laptop  users  tend  to  surf/chat/e-­‐mail/game/etc.  

–  They  also  distract  those  around  them  –  You  will  get  plenty  of  Dme  in  front  of  your  computers  while  working  on  the  course  projects  

•  Instead:  –  Pay  aOenDon,  ask  quesDons,  and  take  notes!  

CIS120  /  Spring  2013   14  

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RecitaDons  /  Lab  SecDons  

•  First  recitaDon,  TODAY  and  TOMORROW  –  Bring  your  laptops  –  AOendance  won’t  be  counted  unDl  next  week  

•  Goals  of  first  meeDng:  – Meet  your  TAs  and  classmates  –  Set  up  tools  (OCaml,  eclipse)  your  laptops  

–  Get  to  see  a  bit  of  OCaml  

•  If  you  need  to  register/switch  recitaDon  secDons,  contact  Jackie  Caliman  ([email protected])  

CIS120  /  Spring  2013   15  

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(Selected)  CIS  120  Homeworks  

CIS120  /  Spring  2013   16  

10  homework  assignments  total,    weighted  equally  

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Final  projects  

CIS120  /  Spring  2013   17  

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Homework  Policies  •  Projects  will  be  (mostly)  automaDcally  graded  

–  We’ll  give  you  some  tests,  as  part  of  the  assignment  –  You’ll  write  your  own  tests  to  supplement  these    –  Our  grading  script  will  apply  addiDonal  tests  –  Your  score  is  based  on  how  many  of  these  you  pass  –  Your  code  must  compile  to  get  any  credit  

•  You  will  be  given  your  score  (on  the  automaDcally  graded  porDon  of  the  assignment)  immediately  

•  MulDple  submissions  are  allowed  –  First  few  submissions:  no  penalty  –  Each  submission  aqer  the  first  few  will  be  penalized  –  Your  final  grade  is  determined  by  the  best  raw  score    

•  Late  submissions  –  10  point  penalty  if  less  than  24  hours  late  –  20  point  penalty  if  24-­‐48  hours  late  –  Submissions  not  accepted  a2er  48  hours  past  the  deadline  

CIS120  /  Spring  2013   18  

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Exam  Dates  

•  12%  First  midterm:  Friday,  February  15th,  in  class  

•  12%  Second  midterm:    Friday,  March  29th,  in  class  

•  20%  Final  exam:  Friday,  May  3rd,  9AM  

•  Contact  me  in  advance  if  you  have  a  conflict    

CIS120  /  Spring  2013   19  

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Academic  Integrity  

•  All  submiOed  homework  must  be  individual  work  

•  Course  staff  will  check  for  copying.            Viola1ons  will  be  treated  seriously!  

•  If  in  doubt,  ask.  

CIS120  /  Spring  2013   20  

Not  OK:    -­‐  Copying  /  sharing  of  code      -­‐  Discussions  of  specific  homework  problems  with  other  students  

OK  /  encouraged:    -­‐  “High  level”  discussions  of  concepts  from  lecture  

Penn’s  code  of  academic  integrity:            hOp://www.vpul.upenn.edu/osl/acadint.html  

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Where  to  ask  quesDons  

•  Course  material  –  Piazza  Discussion  Boards  –  TA  email  ([email protected])  

–  TA  office  hours,  schedule  on  webpage  –  Tutoring,  Sunday  and  Monday  evenings  

–  Prof  office  hours:  Mon.  3:30-­‐5:00pm,  or  by  appt              Today:  3:30  –  5  PM  

•  HW/Exam  Grading:  see  webpage  

•  About  the  CIS  majors  – Ms.  Jackie  Caliman,  CIS  Undergraduate  coordinator  

CIS120  /  Spring  2013   21  

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Program  Design  

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Course  goal  

•  BeauDful  code  –  is  simple  –  is  easy  to  understand  –  is  likely  to  be  correct  –  is  easy  to  maintain  –  takes  skill  to  develop  

•  BeauDful  code  stems  from  a  good  design  process  

CIS120  /  Spring  2013   23  

Strive  for  beau1ful  code.  

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Fundamental  Design  Process  

CIS120  /  Spring  2013   24  

1.  Understand  the  problem  What  are  the  relevant  concepts  and  how  do  they  relate?  

2.  Formalize  the  interface  How  should  the  program  interact  with  its  environment?  

3.  Write  test  cases  How  does  the  program  behave  on  typical  inputs?    On  unusual  

ones?    On  erroneous  ones?  4.  Implement  the  required  behavior  

Oqen  by  decomposing  the  problem  into  simpler  ones  and  applying  the  same  recipe  to  each  

Design  is  the  process  of  translaDng  informal  specificaDons  (“word  problems”)  into  running  code.  

5.  Revise  /  Refactor  /  Edit  


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