diff --git a/lab04/lab04.cpp b/lab04/lab04.cpp
index 86de7aa..99a3276 100644
--- a/lab04/lab04.cpp
+++ b/lab04/lab04.cpp
@@ -39,9 +39,30 @@ void test_print_in_hex() {
     print_in_hex(0xff); cout << "\n";
 }
 
+const uint8_t* as_bytes(const void* data) {
+    return reinterpret_cast<const uint8_t*>(data);
+}
+
+void print_in_hex(const void* data, size_t size) {
+    const uint8_t* bytes = as_bytes(data);
+    for (size_t i = 0; i < size; i++) {
+        print_in_hex(bytes[i]);
+        cout << ((i + 1) % 16 == 0 ? '\n' : ' ');
+    }
+}
+
+void test_print_array_in_hex() {
+    uint32_t u32 = 0x42;
+    cout << "u32 bytes: ";
+    print_in_hex(&u32, sizeof(u32));
+    cout << "\n";
+}
+
+
 int main() {
     test_nibble_to_hex();
     test_nibbles();
     test_print_in_hex();
+    test_print_array_in_hex();
     return 0;
 }