Lexical and Syntax Project
Pascal Programming Language (subset)
Design and implement a Lexical Analyzer for a subset of the Pascal Programming Language.
Your program should be able to accept as input a file containing statements in Pascal and
correctly perform a lexical analysis of each statement.
Samples of the output and sample C code for a lexical analyzer for tokens and lexemes can be
found in the textbook Chapter 4.2. The chapter is also screenshotted below.
1. You will need to create a list (some structure to store) of the reserved words for Pascal.
(See the link to the Pascal site).
https://www.tutorialspoint.com/pascal/pascal_basic_syntax.htm
2. You will need to create a list of various operators used in Pascal by category, for example
token ASSIGN_OP
lexeme :=
3. You will need to create a list of acceptable characters for variables and constants.
4. You will need to write code to test the validity of identifiers, If a string does not match
any of the categories, you should indicate that as UNKNOWN.
I will post the ámple code&ile you can use to test your Lexical Analyzer.
Sample Code
PROGRAM ChangeMaker;
(* Make change for a dollar *)
VAR
Cost: INTEGER;
Remainder: INTEGER;
Quarters: INTEGER;
Nickels: INTEGER;
Pennies: INTEGER;
Dimes: INTEGER;
BEGIN
(* Input the Cost *)
Write(‘Enter the cost in cents: ‘);
Read(Cost);
(* Make the Change *)
Remainder := 100 – Cost;
Quarters := Remainder DIV 25;
Remainder := Remainder MOD 25;
Dimes := Remainder DIV 10;
Remainder := Remainder MOD 10;
Nickels := Remainder DIV 5;
Remainder := Remainder MOD 5;
Pennies := Remainder;
(* Output the coin count *)
Writeln(‘The change is ‘);
WriteLn(Quarters: 2, ‘ quarters’);
WriteLn(Dimes: 2, ‘ dimes’);
WriteLn(Nickels: 2, ‘ nickels’);
WriteLn(Pennies: 2, ‘ pennies’);
END. (* ChangeMaker *)
Chapter 4.2: Concepts of Programming Languages

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