diff --git a/lab04/lab04.cpp b/lab04/lab04.cpp
index cc4e256..86de7aa 100644
--- a/lab04/lab04.cpp
+++ b/lab04/lab04.cpp
@@ -28,8 +28,20 @@ void test_nibbles() {
     cout << "Nibble extraction tests passed!\n";
 }
 
+void print_in_hex(uint8_t byte) {
+    cout << nibble_to_hex(high_nibble(byte))
+        << nibble_to_hex(low_nibble(byte));
+}
+
+void test_print_in_hex() {
+    print_in_hex(0x0); cout << "\n";
+    print_in_hex(0xab); cout << "\n";
+    print_in_hex(0xff); cout << "\n";
+}
+
 int main() {
     test_nibble_to_hex();
     test_nibbles();
+    test_print_in_hex();
     return 0;
 }