ptrdiff_t(3type)                                              ptrdiff_t(3type)

NAME
       ptrdiff_t - count of elements or array index

LIBRARY
       Standard C library (libc)

SYNOPSIS
       #include <stddef.h>

       typedef /* ... */  ptrdiff_t;

DESCRIPTION
       Used for a count of elements, or an array index.  It is the result of
       subtracting two pointers.  It is a signed integer type capable of
       storing values in the range [PTRDIFF_MIN, PTRDIFF_MAX].

       The length modifier for ptrdiff_t for the printf(3) and the scanf(3)
       families of functions is t, resulting commonly in %td or %ti for
       printing ptrdiff_t values.

STANDARDS
       C11, POSIX.1-2024.

HISTORY
       C89, SUSv1, POSIX.1-2001.

SEE ALSO
       size_t(3type)

Linux man-pages 6.19              2026-02-08                  ptrdiff_t(3type)