こんなテクニックあるんだ……！
Xマクロ [ C言語 > 基本構文 > 疑似命令とプリプロセッサ ]
https://laboict.cloudfree.jp/?C%B8%C0%B8%EC%2F%B4%F0%CB%DC%B9%BD%CA%B8%2F%B5%BF%BB%F7%CC%BF%CE%E1%A4%C8%A5%D7%A5%EA%A5%D7%A5%ED%A5%BB%A5%C3%A5%B5%2FX%A5%DE%A5%AF%A5%ED
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