ATOI(3) Linux Programmer's Manual ATOI(3) 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 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. 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) COLOPHON This page is part of release 3.74 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/. GNU 2014-08-19 ATOI(3)
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