diff --git a/labs/04/code_generator.py b/labs/04/code_generator.py
new file mode 100644
index 0000000..842c99c
--- /dev/null
+++ b/labs/04/code_generator.py
@@ -0,0 +1,19 @@
+import random
+
+lines = [
+    "// basic code\n",
+    "//float b\n",
+    "f b\n",
+    "// integer a\n",
+    "i a\n",
+    "// a = 5\n",
+    "a = 5\n",
+    "// b = a + 3.2\n",
+    "b = a + 3.2\n",
+    "//print 8.5\n",
+    "p b\n"
+]
+
+with open("example.ac", "w") as f:
+    for line in lines:
+        f.write(line)
diff --git a/labs/04/example.ac b/labs/04/example.ac
new file mode 100644
index 0000000..b8d4eab
--- /dev/null
+++ b/labs/04/example.ac
@@ -0,0 +1,11 @@
+// basic code
+//float b
+f b
+// integer a
+i a
+// a = 5
+a = 5
+// b = a + 3.2
+b = a + 3.2
+//print 8.5
+p b
diff --git a/labs/04/lex_analyzer.l b/labs/04/lex_analyzer.l
new file mode 100644
index 0000000..c93cee7
--- /dev/null
+++ b/labs/04/lex_analyzer.l
@@ -0,0 +1,42 @@
+%{
+#include <stdio.h>
+%}
+
+    // Token definitions
+%%
+"//"[^\n]*         { printf("COMMENT\n"); }         // Match comments
+"f"                { printf("floatdcl \n"); }     // Match float declarations
+"i"                { printf("intdcl \n"); }       // Match integer declarations
+"p"                { printf("print \n"); }        // Match print commands
+[a-zA-Z][a-zA-Z0-9]* { printf("id "); }            // Match identifiers (no newline here)
+"="                { printf("assign "); }           // Match assignment operator (no newline)
+[0-9]+             { printf("inum\n"); }            // Match integers
+[0-9]+\.[0-9]+     { printf("fnum\n"); }            // Match floating-point numbers
+\+                 { printf("plus "); }             // Match the plus operator (no newline)
+[ \t]+             { /* Ignore spaces and tabs */ } // Ignore spaces and tabs explicitly
+\n                 { /* Ignore standalone newlines */ }
+.                  { printf("Unrecognized token: %s\n", yytext); } // Handle unrecognized tokens
+
+%%
+
+int main(int argc, char **argv) {
+    if (argc != 2) {
+        printf("Usage: %s <input_file>\n", argv[0]);
+        return 1;
+    }
+
+    FILE *file = fopen(argv[1], "r");
+    if (!file) {
+        perror("Error opening file");
+        return 1;
+    }
+
+    yyin = file;
+    yylex();
+    fclose(file);
+    return 0;
+}
+
+int yywrap() {
+    return 1;
+}
diff --git a/labs/04/makefile b/labs/04/makefile
new file mode 100644
index 0000000..9f43ee1
--- /dev/null
+++ b/labs/04/makefile
@@ -0,0 +1,12 @@
+LEX = flex
+CC = gcc
+OUTPUT = lex_analyzer
+
+all: $(OUTPUT)
+
+$(OUTPUT): lex_analyzer.l
+	$(LEX) lex_analyzer.l
+	$(CC) lex.yy.c -o $(OUTPUT)
+
+clean:
+	rm -f lex.yy.c $(OUTPUT)