ATOI(3) BSD Library Functions Manual ATOI(3)NAMEatoi — 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);
SEE ALSOatof(3), atol(3), strtod(3), strtol(3), strtoul(3)STANDARDS
The atoi() function conforms to ANSI X3.159-1989 (“ANSI C89”).
CAVEATSatoi does no overflow checking, handles unsigned numbers poorly, and han‐
dles strings containing trailing extra characters (like “123abc”) poorly.
Careful use of strtol(3) and strtoul(3) can alleviate these problems.
BSD June 4, 1993 BSD