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    "# 3.1 结构化程序设计"
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    "<img src = \"images/ch3/1.png\">"
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   "source": [
    "结构化程序设计是一种进行程序设计的原则和方法，其特点是只有一个入口、一个出口。按照这种原则和方法可设计出结构清晰、容易理解、容易修改、容易验证的程序。\n",
    "其目标是使程序具有一个合理结构，以保证和验证程序的正确性，从而开发出正确、合理的程序。结构化程序设计采用自顶向下、逐步求精的设计方法，各个模块通过“顺序、选择(分支)、循环”的控制结构进行连接。"
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