ATOI(3) |
Library Functions Manual |
ATOI(3) |
NAME
atoi — convert ASCII string to integer
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdlib.h>
int
atoi(const char *nptr);
DESCRIPTION
The
atoi() function converts the initial portion of the string pointed to by
nptr to
integer representation.
It is equivalent to:
(int)strtol(nptr, (char **)NULL, 10);
STANDARDS
The atoi() function conforms to ANSI X3.159-1989 (“ANSI C89”).
CAVEATS
atoi does no overflow checking, handles unsigned numbers poorly, and handles strings containing trailing extra characters (like “123abc”) poorly. Careful use of
strtol(3) and
strtoul(3) can alleviate these problems.