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    "# Exceptions & Testing\n",
    "\n",
    "This chapter covers two practical skills every programmer needs:\n",
    "\n",
    "- handling errors and invalid input gracefully\n",
    "- diagnosing and fixing bugs systematically\n"
   ]
  },
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   "source": [
    "<h2>Why This Matters</h2>\n",
    "\n",
    "As programs grow, failures shift from obvious syntax errors to subtle runtime behavior:\n",
    "\n",
    "- malformed input\n",
    "- missing files\n",
    "- invalid assumptions\n",
    "- state bugs that only appear for specific cases\n",
    "\n",
    "You need a system for both **prevention** and **diagnosis**.\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "084dbdf2",
   "metadata": {},
   "source": [
    "<h2>Learning Goals</h2>\n",
    "\n",
    "By the end of this chapter, you should be able to:\n",
    "\n",
    "- validate inputs before risky operations\n",
    "- handle runtime exceptions intentionally\n",
    "- debug behavior using breakpoints and watches\n",
    "- communicate failures with actionable messages\n",
    "\n",
    "<h2>Chapter Flow</h2>\n",
    "\n",
    "```{tableofcontents}\n",
    "```\n"
   ]
  }
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   "name": "csharp"
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