man3/gcvt.3

   1 .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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  23 .\" References consulted:
  24 .\"     Linux libc source code
  25 .\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
  26 .\"     386BSD man pages
  27 .\" Modified Sat Jul 24 19:32:25 1993 by Rik Faith (faith@cs.unc.edu)
  28 .TH GCVT 3  2007-07-26 "" "Linux Programmer's Manual"
  29 .SH NAME
  30 gcvt \- convert a floating-point number to a string
  31 .SH SYNOPSIS
  32 .nf
  33 .B #include <stdlib.h>
  34 .sp
  35 .BI "char *gcvt(double " number ", size_t " ndigit ", char *" buf );
  36 .fi
  37 .sp
  38 .in -4n
  39 Feature Test Macro Requirements for glibc (see
  40 .BR feature_test_macros (7)):
  41 .in
  42 .sp
  43 .BR gcvt ():
  44 _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 500
  45 .SH DESCRIPTION
  46 The
  47 .BR gcvt ()
  48 function converts \fInumber\fP to a minimal length NULL
  49 terminated ASCII string and stores the result in \fIbuf\fP.
  50 It produces \fIndigit\fP significant digits in either
  51 .BR printf (3)
  52 F format or E format.
  53 .SH "RETURN VALUE"
  54 The
  55 .BR gcvt ()
  56 function returns the address of the string pointed to
  57 by \fIbuf\fP.
  58 .SH "CONFORMING TO"
  59 marked as LEGACY in POSIX.1-2001.
  60 .SH NOTES
  61 This function is obsolete.
  62 Instead,
  63 .BR sprintf (3)
  64 is recommended.
  65 .SH "SEE ALSO"
  66 .BR ecvt (3),
  67 .BR fcvt (3),
  68 .BR sprintf (3)