man3/atof.3

   1 .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
   2 .\"
   3 .\" SPDX-License-Identifier: Linux-man-pages-copyleft
   4 .\"
   5 .\" References consulted:
   6 .\"     Linux libc source code
   7 .\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
   8 .\"     386BSD man pages
   9 .\" Modified Mon Mar 29 22:39:24 1993, David Metcalfe
  10 .\" Modified Sat Jul 24 21:39:22 1993, Rik Faith (faith@cs.unc.edu)
  11 .TH atof 3 (date) "Linux man-pages (unreleased)"
  12 .SH NAME
  13 atof \- convert a string to a double
  14 .SH LIBRARY
  15 Standard C library
  16 .RI ( libc ", " \-lc )
  17 .SH SYNOPSIS
  18 .nf
  19 .B #include <stdlib.h>
  20 .PP
  21 .BI "double atof(const char *" nptr );
  22 .fi
  23 .SH DESCRIPTION
  24 The
  25 .BR atof ()
  26 function converts the initial portion of the string
  27 pointed to by \fInptr\fP to
  28 .IR double .
  29 The behavior is the same as
  30 .PP
  31 .in +4n
  32 .EX
  33 strtod(nptr, NULL);
  34 .EE
  35 .in
  36 .PP
  37 except that
  38 .BR atof ()
  39 does not detect errors.
  40 .SH RETURN VALUE
  41 The converted value.
  42 .SH ATTRIBUTES
  43 For an explanation of the terms used in this section, see
  44 .BR attributes (7).
  45 .ad l
  46 .nh
  47 .TS
  48 allbox;
  49 lbx lb lb
  50 l l l.
  51 Interface       Attribute       Value
  52 T{
  53 .BR atof ()
  54 T}      Thread safety   MT-Safe locale
  55 .TE
  56 .hy
  57 .ad
  58 .sp 1
  59 .SH STANDARDS
  60 POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
  61 .SH SEE ALSO
  62 .BR atoi (3),
  63 .BR atol (3),
  64 .BR strfromd (3),
  65 .BR strtod (3),
  66 .BR strtol (3),
  67 .BR strtoul (3)