atof - convert a string to a double
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.
For an explanation of the terms used in this section, see attributes(7).
POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
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