Tcl_PrintDouble man page on BSDi

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Tcl_PrintDouble(3)    Tcl Library Procedures   Tcl_PrintDouble(3)

_________________________________________________________________

NAME
       Tcl_PrintDouble - Convert floating value to string

SYNOPSIS
       #include <tcl.h>

       Tcl_PrintDouble(interp, value, dst)

ARGUMENTS
       Tcl_Interp   *interp   (in)	Interpreter that controls
					the conversion.

       double	    value     (in)	Floating-point	value  to
					be converted.

       char	    *dst      (out)	Where	to  store  string
					representing value.  Must
					have  at  least	 TCL_DOU-
					BLE_SPACE  characters  of
					storage.
_________________________________________________________________

DESCRIPTION
       Tcl_PrintDouble	generates  a  string  that represents the
       value of value and stores it in	memory	at  the	 location
       given  by  dst.	It uses %g format to generate the string,
       with two special twists.	 First, the string is  guaranteed
       to  contain  either a ``.'' or an ``e'' so that it doesn't
       look like an integer (where %g would generate  an  integer
       with no decimal point, Tcl_PrintDouble adds ``.0'').  Sec-
       ond, the number of significant digits printed  at  dst  is
       controlled  by  the  tcl_precision variable in interp;  if
       tcl_precision is undefined then 6 significant  digits  are
       printed.

KEYWORDS
       conversion, double-precision, floating-point, string

Tcl			       7.0				1

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