ATOI
Section: Linux Programmer's Manual (3)
Updated: 2014-08-19
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NAME
atoi, atol, atoll - 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);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
atoll():
-
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;
or
cc -std=c99
DESCRIPTION
The
atoi()
function converts the initial portion of the string
pointed to by nptr to
int.
The behavior is the same as
strtol(nptr, 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.
RETURN VALUE
The converted value.
ATTRIBUTES
Multithreading (see pthreads(7))
The
atoi(),
atol(),
and
atoll()
functions are thread-safe with exceptions.
These functions can be safely used in multithreaded applications,
as long as
setlocale(3)
is not called to change the locale during their execution.
CONFORMING TO
SVr4, POSIX.1-2001, 4.3BSD, C99.
C89 and
POSIX.1-1996 include the functions
atoi()
and
atol()
only.
NOTES
Linux libc provided
atoq()
as an obsolete name for
atoll();
atoq()
is not provided by glibc.
SEE ALSO
atof(3),
strtod(3),
strtol(3),
strtoul(3)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ATTRIBUTES
-
- Multithreading (see pthreads(7))
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
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Time: 02:55:18 GMT, September 18, 2014