Example 2: Using pluglets as a macro environment.
例2：将pluglet作为一个宏环境使用。
In the next example, we are going to perform the famous swap! Macro.
在下一个示例中，我们要执行swap ！宏。
It would be utilized as shown in this example, which USES the macro to determine the method of writing double quotes in ISO C99 portable code.
对wchar_t的利用如这个示例所示，使用宏确定在ISO C99可移植代码中写双引号的方法。
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