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NAME

atoi — convert ASCII string to integer

LIBRARY

library “libc”

SYNOPSIS

#include <stdlib.h>

int
atoi(const char *nptr);

SEE ALSO

atof(3), atol(3), strtod(3), strtol(3), strtoul(3)

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.