atoi, atol, atoll - convert a string to an integer
The atoi() function converts the initial portion of
the string pointed to by
int. The behavior is
the same as
strtol(nptr, NULL, 10);
except that atoi() does not detect errors.
The converted value or 0 on error.
POSIX.1 leaves the return value of atoi() on error unspecified. On glibc, musl libc, and uClibc, 0 is returned on error.
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