Name
ecvt, fcvt — convert a floating-point number to a string
Synopsis
#include <stdlib.h>
char *ecvt( |
double number, |
| int ndigits, | |
| int *decpt, | |
int *sign); |
char *fcvt( |
double number, |
| int ndigits, | |
| int *decpt, | |
int *sign); |
![[Note]](../stylesheet/note.png) |
Note | ||
|---|---|---|---|
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DESCRIPTION
The ecvt() function converts
number to a
null-terminated string of ndigits digits (where
ndigits is reduced to
a system-specific limit determined by the precision of a
double), and returns a pointer to
the string. The high-order digit is nonzero, unless
number is zero. The
low order digit is rounded. The string itself does not
contain a decimal point; however, the position of the decimal
point relative to the start of the string is stored in
*decpt. A negative
value for *decpt
means that the decimal point is to the left of the start of
the string. If the sign of number is negative, *sign is set to a nonzero value,
otherwise it is set to 0. If number is zero, it is
unspecified whether *decpt is 0 or 1.
The fcvt() function is
identical to ecvt(), except
that ndigits
specifies the number of digits after the decimal point.
RETURN VALUE
Both the ecvt() and
fcvt() functions return a
pointer to a static string containing the ASCII
representation of number. The static string is
overwritten by each call to ecvt() or fcvt().
CONFORMING TO
SVr2; marked as LEGACY in POSIX.1-2001. POSIX.1-2008
removes the specifications of ecvt() and fcvt(), recommending the use of sprintf(3) instead (though
snprintf(3) may be
preferable).
NOTES
Linux libc4 and libc5 specified the type of ndigits as size_t. Not all locales use a point as the
radix character ("decimal point").
COLOPHON
This page is part of release 3.24 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
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Copyright 1993 David Metcalfe (davidprism.demon.co.uk) 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. References consulted: Linux libc source code Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) 386BSD man pages Modified Sat Jul 24 19:40:39 1993 by Rik Faith (faithcs.unc.edu) Modified Fri Jun 25 12:10:47 1999 by Andries Brouwer (aebcwi.nl) |