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https://edonymu.com/2017/02/13/c%e8%af%ad%e8%a8%80%e5%ae%8f%e5%ae%9a%e4%b9%89%e7%9a%84%e4%b8%80%e4%ba%9b%e6%80%bb%e7%bb%93/
C语言宏定义的一些总结