| .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
| .\" |
| .\" %%%LICENSE_START(VERBATIM) |
| .\" Permission is granted to make and distribute verbatim copies of this |
| .\" manual provided the copyright notice and this permission notice are |
| .\" preserved on all copies. |
| .\" |
| .\" Permission is granted to copy and distribute modified versions of this |
| .\" manual under the conditions for verbatim copying, provided that the |
| .\" entire resulting derived work is distributed under the terms of a |
| .\" permission notice identical to this one. |
| .\" |
| .\" Since the Linux kernel and libraries are constantly changing, this |
| .\" manual page may be incorrect or out-of-date. The author(s) assume no |
| .\" responsibility for errors or omissions, or for damages resulting from |
| .\" the use of the information contained herein. The author(s) may not |
| .\" have taken the same level of care in the production of this manual, |
| .\" which is licensed free of charge, as they might when working |
| .\" professionally. |
| .\" |
| .\" Formatted or processed versions of this manual, if unaccompanied by |
| .\" the source, must acknowledge the copyright and authors of this work. |
| .\" %%%LICENSE_END |
| .\" |
| .\" References consulted: |
| .\" Linux libc source code |
| .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) |
| .\" 386BSD man pages |
| .\" Modified Mon Mar 29 22:39:24 1993, David Metcalfe |
| .\" Modified Sat Jul 24 21:39:22 1993, Rik Faith (faith@cs.unc.edu) |
| .TH ATOF 3 2016-12-12 "GNU" "Linux Programmer's Manual" |
| .SH NAME |
| atof \- convert a string to a double |
| .SH SYNOPSIS |
| .nf |
| .B #include <stdlib.h> |
| .PP |
| .BI "double atof(const char *" nptr ); |
| .fi |
| .SH DESCRIPTION |
| The |
| .BR atof () |
| function converts the initial portion of the string |
| pointed to by \fInptr\fP to |
| .IR double . |
| The behavior is the same as |
| .PP |
| .in +4n |
| .EX |
| strtod(nptr, NULL); |
| .EE |
| .in |
| .PP |
| except that |
| .BR atof () |
| does not detect errors. |
| .SH RETURN VALUE |
| The converted value. |
| .SH ATTRIBUTES |
| For an explanation of the terms used in this section, see |
| .BR attributes (7). |
| .TS |
| allbox; |
| lb lb lb |
| l l l. |
| Interface Attribute Value |
| T{ |
| .BR atof () |
| T} Thread safety MT-Safe locale |
| .TE |
| .SH CONFORMING TO |
| POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD. |
| .SH SEE ALSO |
| .BR atoi (3), |
| .BR atol (3), |
| .BR strfromd (3), |
| .BR strtod (3), |
| .BR strtol (3), |
| .BR strtoul (3) |
