NAME

       countof, _Countof - count the number of elements in an array

LIBRARY

       Standard C library (libc)

SYNOPSIS

       #include <stdcountof.h>

       size_t countof(array);

DESCRIPTION

       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>.

RETURN VALUE

       The number of elements in the array.

STANDARDS

       C2y.

HISTORY

       gcc 16, clang 21.

SEE ALSO

       operator(7)

Linux man-pages 6.16                               2025-08-19                                         countof(3)