diff --git a/lab04/lab04.cpp b/lab04/lab04.cpp
index 99a3276..bd4efef 100644
--- a/lab04/lab04.cpp
+++ b/lab04/lab04.cpp
@@ -58,11 +58,27 @@ void test_print_array_in_hex() {
     cout << "\n";
 }
 
+char bit_digit(uint8_t byte, uint8_t bit) {
+    return (byte & (1 << bit)) ? '1' : '0';
+}
+
+void print_in_binary(uint8_t byte) {
+    for (int8_t bit = 7; bit >= 0; --bit) {
+        cout << bit_digit(byte, bit);
+    }
+}
+
+void test_print_in_binary() {
+    print_in_binary(0x2a); cout << "\n"; // 00101010
+}
+
+
 
 int main() {
     test_nibble_to_hex();
     test_nibbles();
     test_print_in_hex();
     test_print_array_in_hex();
+    test_print_in_binary();
     return 0;
 }