YACC PROGRAM to recognize the grammar (a^n)(b^n)

program to recognize the grammar (a^n)(b^n) where n>=0

6.l

%{

#include "y.tab.h"

%}

%%

"a"|"A" {return A;}

"b"|"B" {return B;}

[ \t] {;}

\n {return 0;}

. {return yytext[0];}

%%

6.y

%{

#include<stdio.h>

%}

%token A B

%%

stmt: S

    ;

S: A S B

  |

 ;

%%

void main()

{

printf("enter \n");

yyparse();

printf("valid");

exit(0);

}

void yyerror()

{

printf("invalid ");

exit(0);

}