Lexical Analyzer for Sample Language

                       In this post, we will see LEX code to generate Lexical Analyzer for sample language.

LEX YACC program to check / recognize valid Arithmetic Expression

                  In this post, we will see LEX and YACC programs to check or recognize valid arithmetic expression. This expression may have operations like Addition(+), Subtraction(-), Multiplication(*), Division(/) or Modulus(%). Expression may contain balanced round brackets.

                 Explanation of the program, is given at the end of this post.
                Go through the following programs:

LEX & YACC

                  Go through the following posts:

1. LEX YACC program to evaluate arithmetic expression

2. LEX YACC program to check validity of Arithmetic Expression 

3. Lexical Analyzer for Sample Language

4. LEX YACC To Parse Input Text File

Compiler

                          Go through the following posts:

1. Interview / Viva Questions on Compiler Design

2. Six phases of Compiler with an Example

3. LEX YACC program to evaluate arithmetic expression

Concurrent YACC to Parse Input Text File

(With the help from Prof. Shailesh Cheke)
                In this post, we will see concurrent Lex-YACC program to parse a input text file which consists of several arithmetic expressions.
                To create threads, here we have used OpenMP API. To avoid race condition among threads to get access of global variables (like yylval, yyin, yytext), we have to use re-entrant parser. 

                Go through the following program:

LEX YACC To Parse Input Text File

            In this post, we will see how to provide text file as input to Lex Yacc program. Here we will take example of arithmetic expression evaluation which takes arithmetic expressions from a text file.
           yyin is standard file pointer which is defined by lex yacc library. So that, just we have to declare it in yacc file by using keyword extern.
           
            Go through the following program:

Intermediate code generation for sample language using LEX and YACC

                   In this post, we will see Intermediate code generation or three address code generation for sample language (here C Language) using LEX and YACC.
                   Following are the input file (input.txt), LEX & YACC files (intmcode.l, intmcode.y). Output is given at the end of this post.

LEX YACC program to evaluate arithmetic expression ( LEX and YACC programs for arithmetic expression evaluation )

                 In this post, I have given a LEX and YACC program to evaluate arithmetic expression. 
                 (Note: If you want to check just validity of arithmetic expression (i.e. valid or invalid), go through this post: LEX YACC program to check / recognize valid Arithmetic Expression)
                 Here arithmetic expression may have operations like Addition(+), Subtraction(-), Multiplication(*), Division(/) or Modulus(%). Expression may contain balanced round brackets.
                 Explanation of the program, is given at the end of this post.
                Go through the following programs: