Linux 2.6 - man page for atof (linux section 3posix)
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ATOF(P) POSIX Programmer's Manual ATOF(P)
atof - convert a string to a double-precision number
double atof(const char *str);
The call atof(str) shall be equivalent to:
except that the handling of errors may differ. If the value cannot be represented, the
behavior is undefined.
The atof() function shall return the converted value if the value can be represented.
No errors are defined.
The following sections are informative.
The atof() function is subsumed by strtod() but is retained because it is used extensively
in existing code. If the number is not known to be in range, strtod() should be used
because atof() is not required to perform any error checking.
strtod() , the Base Definitions volume of IEEE Std 1003.1-2001, <stdlib.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and The Open Group
Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 ATOF(P)
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