Tcl_PrintDouble(3Tcl)					 Tcl_PrintDouble(3Tcl)

NAME    [Toc]    [Back]

     Tcl_PrintDouble - Convert floating	value to string

SYNOPSIS    [Toc]    [Back]

     #include <tcl.h>

     Tcl_PrintDouble(interp, value, dst)

ARGUMENTS    [Toc]    [Back]

     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_DOUBLE_SPACE characters of storage.

DESCRIPTION    [Toc]    [Back]

     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'').  Second, 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    [Toc]    [Back]

     conversion, double-precision, floating-point, string


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