Lex program for a simple calculator

Author: root

scal.l

@@ -0,0 +1,29 @@
+%{
+/*Lex program for a simple calculator */	
+
+	#include "y.tab.h"
+	#include<stdlib.h>
+	#include<stdio.h>
+	
+	int yylineno;
+		
+%}
+
+
+number  [0-9]+
+op 	[-|+|*|/]	
+
+%%
+
+" "  		;
+[\n]		return END;
+{op}		return *yytext;
+\%		return *yytext;
+\^		return *yytext;
+{number}	{
+			yylval.val=atoi(yytext);
+			return NUMBER;
+		}
+[\(\)] 	return *yytext;
+.	yyerror("ERROR");
+%%