Analysis of Programming Language IAG0450 Exam 2016(50p,with test)
A.Theoretical part 25p
Syntax diagram and description in metalanguage
The grammar
Type of translators
Translation and interpretation
Multi-level languages
Evaluation of programming language
Desirable characteristics
Essential characteristics
The scanner
The parser
The code generator and optimization
Error handling
General expressions
Assigment statements
IF statement
GO-TO statement
The loop statements
Data types and variables
Meaning of parentheses
The stack as a programming tools
Structured programming
Subroutines
Built-in functions
User-defined functions
http://groups.engin.umd.umich.edu/CIS/course.des/cis400/
Whats the difference between ANTLR4 and Bison grammar parsing? ( LL(*) vs LALR )
Describe the compilation process from a higher level language, e.g. C, to machine code that runs on some processor.
B.Praxis part 25p
1.Write Flex rules for( define token) INT, DOUBLE,VAR and yylval:
%union{
int intval;
double doubleval;
char *name;
}
2.We have Flex rules:
digit [0-9]
alpha [a-zA-Z]
alphanum [0-9a-zA-Z]
%%
"PROCEDURE" { return PROC; }
"PRINT" { return PRINT;}
{digit}+ { /*täidetakse yylval*/ return INT;}
{alpha}{alphanum}* { /*täidetakse yylval*/ return VAR;}
[=;{}()+-/*] { return yytext[0];}
[ \t\n] {;}
and source
PROCEDURE Arvuta ( x )
{
y = x * x - 5;
PRINT y;
}
Write and explane the tokens sequence for this.
3.We have token VAR and Bison rules:
vars: VAR { $$ = push(id($1)); free($1); }
| VAR vars { $$ = push(id($1)); free($1); }
;
and source a f c g
Descibe translater work.
4.Write ANTLR4 grammar, which accepts playlist file format (*.pls). For example, it should be able to parse the following input:
[playlist]
NumberOfEntries=2
File1=./18 - hammer smashed face.mp3
Title1=Cannbial Corpse - Hammer Smashed Face
Length1=120
File2=http://icecast.err.ee/raadio2.mp3
Title2=Raadio 2
Length1=-1
Version=2
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