Originální popis anglicky:
atoi, atol, atoll, atoq - convert a string to an integer
Návod, kniha: Linux Programmer's Manual
#include <stdlib.h>
int atoi(const char *nptr);
long atol(const char *nptr);
long long atoll(const char *nptr);
long long atoq(const char *nptr);
The
atoi() function converts the initial portion of the string pointed to
by
nptr to
int. The behaviour is the same as
strtol(nptr, (char **)NULL, 10);
except that
atoi() does not detect errors.
The
atol() and
atoll() functions behave the same as
atoi(),
except that they convert the initial portion of the string to their return
type of
long or
long long.
atoq() is an obsolete name for
atoll().
The converted value.
SVID 3, POSIX.1, BSD 4.3, ISO/IEC 9899. ISO/IEC 9899:1990 (C89) and POSIX.1
(1996 edition) include the functions
atoi() and
atol() only; C99
adds the function
atoll().
The non-standard
atoq() function is not present in libc 4.6.27 or glibc
2, but is present in libc5 and libc 4.7 (though only as an inline function in
<stdlib.h> until libc 5.4.44). The
atoll() function is
present in glibc 2 since version 2.0.2, but not in libc4 or libc5.
atof(3),
strtod(3),
strtol(3),
strtoul(3)
