centos man page for tcl_printdouble

Tcl_PrintDouble(3)					      Tcl Library Procedures						Tcl_PrintDouble(3)

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NAME
       Tcl_PrintDouble - Convert floating value to string

SYNOPSIS
       #include <tcl.h>

       Tcl_PrintDouble(interp, value, dst)

ARGUMENTS
       Tcl_Interp *interp (in)		Before	Tcl 8.0, the tcl_precision variable in this interpreter controlled the conversion.  As of Tcl 8.0,
					this argument is ignored and the conversion is controlled by the tcl_precision variable that is now shared
					by all interpreters.

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

       char *dst (out)			Where to store the string representing value.  Must have at least TCL_DOUBLE_SPACE characters of storage.
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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 one special twist: the string is guaranteed to contain either a "."	or an "e" so that it does not look
       like an integer.  Where %g would generate an integer with no decimal point, Tcl_PrintDouble adds ".0".					   |

       If  the	tcl_precision  value  is  non-zero,  the  result  will have precisely that many digits of significance.  If the value is zero (the |
       default), the result will have the fewest digits needed to represent the number in such a way that Tcl_NewDoubleObj will generate the  same |
       number when presented with the given string.  IEEE semantics of rounding to even apply to the conversion.

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

Tcl									8.0							Tcl_PrintDouble(3)