如果除数为0也不会报错，输出结果是一连串的0

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所有程序都可以用分层的思想看，调用其实就是最简单的分层，就是把主函数不太关心的实现过程给抽离了，也就是分层了，更多的时候我们叫做调用，或者封装

现在练习的都是简单的，公司里面都是团队合作的，有些函数功能你根本不用去写，只需要从别人那里调用就行了。还有就是大型程序要划分功能模块，要写伪代码，还要试运行，不可能全在主函数里面写，会写瞎的

这是考虑到程序的简洁性而设计的，你想想，如果你的主函数中需要多次使用到同一个函数，你每次也需要重新编写是不是特别麻烦。而你先将该函数拿出来单独定义，在主函数中直接调用，这不是省略了很多不必要的动作了嘛