ATOI(3) Library Functions Manual ATOI(3)
NAME
atoiconvert 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 ALSO
STANDARDS
The atoi() function conforms to ANSI X3.159-1989 (“ANSI C”).
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.