This technique is sound programming practice in C. it helps prevent real bugs, because putting the literal on the right-hand side makes this always return true.
And while it's not a literal place, it is very real.
而且它不仅是一个“名义国”，它是真实存在着的。
3
Product Semantics solely from the literal or theoretical level is not difficult to understand, but the real applied to product design is not a simple matter.