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countof

Section: C Library Functions (3)
Updated: 202-0-10
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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, gnulib 202507.