diff --git a/Makefile b/Makefile
index a9544ee..3a7cffc 100644
--- a/Makefile
+++ b/Makefile
@@ -1,14 +1,16 @@
-# Basic Makefile example from flex documentation -- provides explicit rules
-# Creates "myprogram" from "scan.l" and "myprogram.c"
-#
-#LEX=flex
-#myprogram: scan.o myprogram.o
-        #$(CC) -o $@ $(LDFLAGS) $^
-#myprogram.o: myprogram.c
-        #$(CC) $(CPPFLAGS) $(CFLAGS) -o $@ -c $^
-#scan.o: scan.c
-        #$(CC) $(CPPFLAGS) $(CFLAGS) -o $@ -c $^
-#scan.c: scan.l
-        #$(LEX) $(LFLAGS) -o $@ $^
-#clean:
-        #$(RM) *.o scan.c
+CC := gcc
+FLEX := flex
+LEX := lexicalStructure.lex
+EXE := lexicalStructure
+
+lexicalStructure:
+	$(FLEX) $(LEX)
+	$(CC) lex.yy.c -o $(EXE)
+
+test_operators:
+	./$(EXE) ./tests/test_operators.alpha
+
+clean:
+	rm -f *.o
+	rm -f lex.yy.c
+	rm -f $(EXE)
diff --git a/lexicalStructure.lex b/lexicalStructure.lex
index 22632ba..dd5b71e 100644
--- a/lexicalStructure.lex
+++ b/lexicalStructure.lex
@@ -1,5 +1,7 @@
-	/*                                    so we placed the citation here. */
-	/* definitions */
+/* Lexical Analysis with Flex (1.6.0) We used some of the code from this manual */
+/*                                    so we placed the citation here. */
+/* definitions */
+
 %option noyywrap
 
 %{ 
@@ -18,6 +20,7 @@ COMMENTCHAR [^\*]|\*[^\)]
 	/*Making the contents of a comment anything that is either not a * or not a * followed by ) to terminate comments at the first ENDCOM */
 %%
 
+
 	/* rules */
 {DIGIT}+ {printf( "C_INTEGER: %s (%d)\n", yytext, atoi( yytext ) );}
 
@@ -29,22 +32,27 @@ COMMENTCHAR [^\*]|\*[^\)]
 
 "false" {printf( "C_FALSE: %s (%d)\n", yytext, atoi( yytext ) );}
 
+	/* OPERATORS */
+
+"+"		{return ADD;}
+"-"		{return SUB_OR_NEG;}
+"*"		{return  MUL;}
+"/"		{return DIV;}
+"%"		{return REM;}
+"<"		{return LESS_THAN;}
+"="		{return EQUAL_TO;}
+":="		{return ASSIGN;}
+"!"		{return NOT;}
+"&"		{return AND;}
+"|"		{return OR;}
+"."		{return DOT;}
+"reserve"	{return RESERVE;}
+"release" 	{return RELEASE;}
+ 
+
 \"{SCHAR}*\" {printf( "C_STRING: %s (%d)\n", yytext, atoi( yytext ) );}
 
 {STARTCOM}{COMMENTCHAR}*{ENDCOM} {printf( "COMMENT: %s (%d)\n", yytext, atoi( yytext ) );}
+ 
 
-.|\n  
-
-%%
-	/* user code */
-
-int main( int argc, char **argv )
-{
-	argc--, argv++; /* skip over program name */
-	if ( argc > 0 )
-		yyin = fopen( argv[0], "r" );
-	else
-		yyin = stdin;
-	yylex();
-
-}
+%%
\ No newline at end of file
diff --git a/tests/test_operators.alpha b/tests/test_operators.alpha
new file mode 100644
index 0000000..b985387
--- /dev/null
+++ b/tests/test_operators.alpha
@@ -0,0 +1,23 @@
++
+-
+*
+/
+\
+%
+<
+>
+=
+:=
+=:
+:
+=
+!
+&
+|
+.
+relEASE
+release
+RELEASE
+reserve
+RESERVE
+reSERVe
\ No newline at end of file