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)