{
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  {
   "cell_type": "markdown",
   "id": "d698094b",
   "metadata": {},
   "source": [
    "# 04-16 · Decimal i pieniądze\n",
    "\n",
    "Praktyka do sekcji [„Decimal jest dokładną arytmetyką dziesiętną”"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "9047592d",
   "metadata": {},
   "source": [
    "## Cel\n",
    "\n",
    "Zrozum różnicę między Decimal(str) a Decimal(float)."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "84b709ee",
   "metadata": {},
   "source": [
    "## Sprawa robocza"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "8df0fd0d",
   "metadata": {
    "execution": {
     "iopub.execute_input": "2026-08-16T10:03:43.969209Z",
     "iopub.status.busy": "2026-08-16T10:03:43.969029Z",
     "iopub.status.idle": "2026-08-16T10:03:43.985468Z",
     "shell.execute_reply": "2026-08-16T10:03:43.985092Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0.3\n"
     ]
    }
   ],
   "source": [
    "from decimal import Decimal\n",
    "print(Decimal(\"0.1\") + Decimal(\"0.2\"))"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "8b9da435",
   "metadata": {},
   "source": [
    "## Eksperyment 1\n",
    "\n",
    "Porównaj Decimal ze sznurka i Decimal z float."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "8492bcad",
   "metadata": {
    "execution": {
     "iopub.execute_input": "2026-08-16T10:03:43.986733Z",
     "iopub.status.busy": "2026-08-16T10:03:43.986618Z",
     "iopub.status.idle": "2026-08-16T10:03:43.988882Z",
     "shell.execute_reply": "2026-08-16T10:03:43.988423Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "19.99\n",
      "19.989999999999998436805981327779591083526611328125\n"
     ]
    }
   ],
   "source": [
    "from decimal import Decimal\n",
    "print(Decimal(\"19.99\"))\n",
    "print(Decimal(19.99))"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "dde36295",
   "metadata": {},
   "source": [
    "## Podstawowa praktyka zadań ★\n",
    "\n",
    "Oblicz kwotę zakupu: cena 24,99, ilość 3 – używając Decimal utworzonego z wiersza."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "3fc1263b",
   "metadata": {
    "execution": {
     "iopub.execute_input": "2026-08-16T10:03:43.989797Z",
     "iopub.status.busy": "2026-08-16T10:03:43.989694Z",
     "iopub.status.idle": "2026-08-16T10:03:43.991841Z",
     "shell.execute_reply": "2026-08-16T10:03:43.991399Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "74.97\n"
     ]
    }
   ],
   "source": [
    "from decimal import Decimal\n",
    "price = Decimal(\"24.99\")\n",
    "quantity = 3\n",
    "print(price * quantity)"
   ]
  }
 ],
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