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double atof(const char *nptr);
The atof() function converts the initial portion of the string pointed
to by nptr to double. The behavior is the same as
except that atof() does not detect errors.
The converted value.
Multithreading (see pthreads(7))
The atof() function is thread-safe with exceptions. It can be safely
used in multithreaded applications, as long as setlocale(3) is not
called to change the locale during its execution.
SVr4, POSIX.1-2001, 4.3BSD, C89, C99.
atoi(3), atol(3), strtod(3), strtol(3), strtoul(3)
GNU 2014-01-22 ATOF(3)