{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "d756f1ac",
   "metadata": {},
   "source": [
    "# 09-21 · Projektowanie warunków\n",
    "\n",
    "Praktyka do sekcji [„Projektowanie warunku: input, validation, boundaries”"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "c11eac68",
   "metadata": {},
   "source": [
    "## Cel\n",
    "\n",
    "Zobacz off-by-one błąd na granicach zasięgu."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "77710b88",
   "metadata": {},
   "source": [
    "## Sprawa robocza"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "9ebc61be",
   "metadata": {
    "execution": {
     "iopub.execute_input": "2026-08-16T17:23:11.547079Z",
     "iopub.status.busy": "2026-08-16T17:23:11.546964Z",
     "iopub.status.idle": "2026-08-16T17:23:11.565581Z",
     "shell.execute_reply": "2026-08-16T17:23:11.565078Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "True\n",
      "False\n"
     ]
    }
   ],
   "source": [
    "number = 1\n",
    "print(1 <= number <= 10)\n",
    "print(1 < number < 10)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "5be9071f",
   "metadata": {},
   "source": [
    "## Podstawowa praktyka zadań ★\n",
    "\n",
    "Porównaj poprawny (włącznie) i nieprawidłowy (ścisły) test brzegowy dla number = 1."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "1765e7f1",
   "metadata": {
    "execution": {
     "iopub.execute_input": "2026-08-16T17:23:11.566568Z",
     "iopub.status.busy": "2026-08-16T17:23:11.566454Z",
     "iopub.status.idle": "2026-08-16T17:23:11.568776Z",
     "shell.execute_reply": "2026-08-16T17:23:11.568359Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "True False\n"
     ]
    }
   ],
   "source": [
    "number = 1\n",
    "in_range_correct = 1 <= number <= 10\n",
    "in_range_buggy = 1 < number < 10\n",
    "print(in_range_correct, in_range_buggy)"
   ]
  }
 ],
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