XII CS - 12.03.2025.pdf for beginners exclusive

This is for whom wishes to know how python works

1. CLASS XII
COMPUTER SCIENCE (083)
PREPARED & PRESENTED BY
VIGNESH S
PGT (COMPUTER SCIENCE)
GOOD SAMARITAN PUBLIC SCHOOL, SIRKALI
COMPUTATIONAL THINKING AND PROGRAMMING -2

2. HOW PROGRAMMING LANGUAGES
ARE MADE
•Creatingaprogramminglanguageinvolvesdefiningitssyntax
(structure),semantics(meaning),andthenbuildingacompiler
orinterpretertotranslatethatcodeintoexecutableinstructions

3. REVISION OF PYTHON TOPICS
COVERED IN CLASS XI.
•TOPICS TO COVER
•PYTHON TOKENS
•CONCEPT OF L VALUE AND R VALUE
•USE OF COMMENTS

4. HOW THE COMPILER WORKS

6. HOW THE LANGUAGE COMPILER WORKS
•Lexicalanalysis(tokenizing)
•Syntaxanalysis(parsing)
•Semanticanalysis
•Optimization,andcodegeneration
•Culminatinginthetranslationofsourcecodeintoexecutablemachine
code

8. FRONT & BACKEND OF PROGRAM
COMPILATION

9. COMPILER WORK FLOW MODEL
•LexicalAnalysis:Tokenizationofsourcecodeintomeaningfulunits
(tokens).
•SyntaxAnalysis:Constructionofaparsetreebasedongrammar
rules.
•SemanticAnalysis:Ensurescorrectnessofmeaning(e.g.,type
checking).
•IntermediateCodeGeneration:Producesanintermediate
representation(IR)foroptimizationandportability.
•CodeOptimization:Enhancestheefficiencyoftheintermediatecode.
•CodeGeneration:TranslatesoptimizedIRintotargetmachinecode.

10. LINKING AND LOADING:
•Linking:Theprocessofcombiningmultipleobjectfilesandresolving
symbolicreferences(suchasfunctioncallsandvariableaccesses)to
generateasingleexecutablefile.
•Loading:Theprocessofplacingtheexecutablefileintomemory,
resolvingruntimeaddresses,andpreparingitforexecutionbythe
CPU.

11. PROGRAM COMPILER WORK FLOW

12. WHAT IS SYMBOL TABLE
•Asymboltableisessentiallyastructuredrepresentationormapping
thatlistsallsymbols(variables,operators,functions,etc.)usedina
programmingcontext.ForarithmeticoperationsinPython.

13. EXAMPLE: SYMBOL TABLE

14. WHAT IS PARSING TREE

15. SYNTAX ANALYSIS
•Syntaxanalysisinvolvescheckingwhether
thecodefollowsthegrammarrulesof
Python.
•Itconstructsaparsetree(orsyntaxtree)to
representthestructureofthecode.

20. INTERMEDIATE / THREE BIT CODE

21. BYTE CODE GENERATION