C++
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Verify the default C version, if you don't specify during compilation:
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Windows:
cmd /c "clang -dM -E - < nul | findstr __STDC_VERSION__"-
(2026-04-01) The default is C17.
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Versions .
C
C89/C90
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Original ANSI/ISO C standard.
C99
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Added
inline,//comments, variable-length arrays, and more standard headers.
C11
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Introduced multithreading (
<threads.h>),_Atomic, and optional bounds checking. -
C11 .
C17
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Bug-fix revision of C11, no major new features.
C23
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Adds UTF-8 literals, improved enums, and more modern conveniences.