1ATOI(3)                    Linux Programmer's Manual                   ATOI(3)
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NAME

6       atoi, atol, atoll, atoq - convert a string to an integer
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SYNOPSIS

9       #include <stdlib.h>
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11       int atoi(const char *nptr);
12       long atol(const char *nptr);
13       long long atoll(const char *nptr);
14       long long atoq(const char *nptr);
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DESCRIPTION

17       The  atoi() function converts the initial portion of the string pointed
18       to by nptr to int.  The behaviour is the same as
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20              strtol(nptr, (char **)NULL, 10);
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22       except that atoi() does not detect errors.
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24       The atol() and atoll() functions behave the same as atoi(), except that
25       they  convert the initial portion of the string to their return type of
26       long or long long.  atoq() is an obsolete name for atoll().
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RETURN VALUE

29       The converted value.
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CONFORMING TO

32       SVr4, POSIX.1-2001, 4.3BSD, C99.   C89  and  POSIX.1-1996  include  the
33       functions atoi() and atol() only.  atoq(3) is a GNU extension.
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NOTES

36       The non-standard atoq() function is not present in libc 4.6.27 or glibc
37       2, but is present in libc5 and libc 4.7 (though only as an inline func‐
38       tion in <stdlib.h> until libc 5.4.44).  The atoll() function is present
39       in glibc 2 since version 2.0.2, but not in libc4 or libc5.
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SEE ALSO

42       atof(3), strtod(3), strtol(3), strtoul(3)
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46GNU                               2000-12-17                           ATOI(3)