diff --git a/labs/04/Makefile b/labs/04/Makefile
new file mode 100644
index 0000000..e63cf85
--- /dev/null
+++ b/labs/04/Makefile
@@ -0,0 +1,20 @@
+LDFLAGS="-L/opt/homebrew/opt/flex/lib"
+CPPFLAGS="-I/opt/homebrew/opt/flex/include"
+
+python:
+	rm -f example.ac
+	python3 code_generator.py > example.ac
+
+stress:
+	python3 code_generator.py --stress
+	lex lexic_analyzer.l
+	gcc  $(CPPFLAGS) $(LDFLAGS) lex.yy.c -o lexical_scan -lfl
+	./lexical_scan < random_code.ac
+
+run:
+	lex lexic_analyzer.l
+	gcc  $(CPPFLAGS) $(LDFLAGS) lex.yy.c -o lexical_scan -lfl
+	./lexical_scan < example.ac
+
+clean:
+	rm -f lex.yy.c lexical_scan
diff --git a/labs/04/lexic_analyzer.l b/labs/04/lexic_analyzer.l
new file mode 100644
index 0000000..9506435
--- /dev/null
+++ b/labs/04/lexic_analyzer.l
@@ -0,0 +1,32 @@
+%{
+#include <stdio.h>
+%}
+
+%option noyywrap
+
+letter		[a-eg-hj-opq-z]
+digit		[0-9]
+integer		{digit}+
+float		(0|[1-9]{digit}*)\.({digit}*[1-9]|0)
+comment		\/{2}.*
+id			{letter}({letter}|{digit})*
+
+%%
+^i			{printf("INT_DEC ");}
+^f			{printf("FLOAT_DEC ");}
+^p          {printf("PRINT ");}
+\=			{printf("ASSIGN ");}
+\-			{printf("MINUS ");}
+\+			{printf("PLUS ");}
+\/			{printf("DIVI ");}
+\*			{printf("MULTI ");}
+{id}		{printf("ID ");}
+{integer}	{printf("INT ");}
+{float}		{printf("FLOAT ");}
+{comment}	{printf("COMMENT ");}
+%%
+
+int main(){
+	yylex();
+	return 0;
+}