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
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().
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)
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