%{
	/* Definition section */
#include <stdio.h>
%}
 
%token NUMBER ID
// setting the precedence 
// and associativity of operators 
%left '+' '-'
%left '*' '/'
 
/* Rule Section */
%% 
E : T	 {
				printf("Result = %d\n", $$);
				return 0;
			}
 
T : 
	T '+' T { $$ = $1 + $3; }
	| T '-' T { $$ = $1 - $3; }
	| T '*' T { $$ = $1 * $3; }
	| T '/' T { $$ = $1 / $3; }
	| '-' NUMBER { $$ = -$2; }
	| '-' ID { $$ = -$2; }
	| '(' T ')' { $$ = $2; }
	| NUMBER { $$ = $1; }
	| ID { $$ = $1; };
% %
 
int main() {
	printf("Enter the expression\n");
	yyparse();
}
 
/* For printing error messages */
int yyerror(char* s) {
	printf("\nExpression is invalid\n");
}
 

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