理解回调函数

依次看这三篇文章:

typedef函数指针用法https://blog.csdn.net/qll125596718/article/details/6891881

函数指针与回调函数 https://www.runoob.com/cprogramming/c-fun-pointer-callback.html

回调函数(callback)是什么? - no.body的回答 - 知乎 https://www.zhihu.com/question/19801131/answer/27459821

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