Predefined Macros
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What is Predefined Macros?
Predefined macros are macros that the compiler defines automatically without any explicit #define, providing information such as the current file name (__FILE__), line number (__LINE__), compilation date (__DATE__), or which C standard is in use (__STDC_VERSION__). They are often used in debugging output or conditional compilation to adapt code based on the compiler or platform. Different compilers may also define their own additional predefined macros beyond the standard set.
Free resources to learn Predefined Macros
More in stage 20: Idioms & Design Patterns
Predefined Macros: common questions
Can I learn Predefined Macros in Hindi?
This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain Predefined Macros in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.
Is this Predefined Macros tutorial for beginners?
It is lesson 115 of 141 in the free C Programming roadmap, in stage 20, Idioms & Design Patterns. If you are new to C Programming, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.