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int atoi(const char *nptr);
long atol(const char *nptr);
long long atoll(const char *nptr);
long long atoq(const char *nptr);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99
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. atoq() is an obsolete name for atoll().
The converted value.
Multithreading (see pthreads(7))
The atoi(), atol(), and atoll() functions are thread-safe with excep-
tions. These functions can be safely used in multithreaded applica-
tions, as long as setlocale(3) is not called to change the locale dur-
ing their execution.
SVr4, POSIX.1-2001, 4.3BSD, C99. C89 and POSIX.1-1996 include the
functions atoi() and atol() only. atoq() is a GNU extension.
The nonstandard 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 func-
tion 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)