Reference

atoi(3)

convert ASCII string to integer

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 int representation.

It is equivalent to:

(int)strtol(nptr, NULL, 10);

The atoi() function has been deprecated by strtol() and should not be used in new code.

ERRORS

The function atoi() need not affect the value of errno on an error.

SEE ALSO

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

STANDARDS

The atoi() function conforms to ISO/IEC 9945-1:1990 (“POSIX.1”), ISO/IEC 9899:1990 (“ISO C90”), and ISO/IEC 9899:1999 (“ISO C99”).

HISTORY

The atoi() function appeared in Version 1 AT&T UNIX.

History