Create Yacc and Lex specification files to recognizes arithmetic expressions involving+,-,* and /.

Code:

%{

#include<stdio.h>

%}

%token ID NUMBER

%left '+' '-'

%left '*' '/'

%%

stmt:expr;

expr: expr '+' expr { $$ = $1 + $3; } | expr '-' expr| expr '*' expr | expr '/' expr | '(' expr

‘)' | NUMBER | ID;

%%

void main()

{

printf("enter expr : \n");

yyparse();

printf("valid exp");

exit(0);

}

void yyerror()

{

printf("invalid exp");

exit(0);

}