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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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countof(3) Library Functions Manual countof(3)
countof, _Countof - count the number of elements in an array
Standard C library (libc)
#include <stdcountof.h>
size_t countof(array);
This operator counts the number of elements in an array.
If the operand is not an array, it produces a compilation error.
There's a keyword, _Countof(), that behaves identically, and can
be used without including <stdcountof.h>.
The number of elements in the array.
C2y.
gcc 16, clang 21.
operator(7)
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Linux man-pages 6.16 2025-08-19 countof(3)
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HTML rendering created 2026-01-16 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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