atoi(3) - Linux man page
Name
atoi, atol, atoll, atoq - convert a string to an integer
Synopsis
#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);
Description
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().
Return Value
The converted value.
Conforming to
SVr4, POSIX.1-2001, 4.3BSD, C99. C89 and POSIX.1-1996 include the functions
atoi() and
atol() only.
atoq(3) is a GNU extension.
Notes
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.
See Also
atof(3),
strtod(3),
strtol(3),
strtoul(3)
Referenced By
set_field_type(3)
