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, POSIX.1-2001.

SEE ALSO
size_t(3type)