约 15,800,000 个结果
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  1. csdn.net
    https://blog.csdn.net/qq_36662437/article/details/81476572

    条件编译#ifdef的妙用详解_透彻 - CSDN博客

  2. zhihu.com
    https://zhuanlan.zhihu.com/p/392217033

    #ifdef #ifndef 这些预处理语句到底怎么用 - 知乎 - 知乎专栏

  3. biancheng.net
    https://c.biancheng.net/view/1986.html

    C语言#if、##ifdef、#ifndef的用法详解，C语言条件编译详解

  4. stackoverflow.com
    https://stackoverflow.com/questions/33117233

    What is the purpose of using #ifdef and #if in C++?

  5. zhihu.com
    https://zhuanlan.zhihu.com/p/366309674

    C语言条件编译（#if，#ifdef，#ifndef，#endif，#else，#elif）！

  6. microsoft.com
    https://learn.microsoft.com/zh-cn/cpp/preprocessor...

    #ifdef 和 #ifndef 指令 (C/C++) | Microsoft Learn

  7. gnu.org
    https://gcc.gnu.org/onlinedocs/cpp/Ifdef.html

    Ifdef (The C Preprocessor) - GCC, the GNU Compiler Collection

  8. cnblogs.com
    https://www.cnblogs.com/klb561/p/9256408.html

    条件编译#ifdef的妙用详解 - konglingbin - 博客园

  9. microsoft.com
    https://learn.microsoft.com/zh-cn/cpp/preprocessor...

    #if、#elif、#else 和 #endif 指令 (C/C++) | Microsoft Learn

  10. zhihu.com
    https://zhuanlan.zhihu.com/p/428028320

    条件编译#ifdef的妙用详解_透彻 - 知乎 - 知乎专栏

  11. 某些结果已被删除