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.so man.macros

.TH Tcl_PrintDouble 3 8.0 Tcl "Tcl Library Procedures"

.BS

.SH NAME

Tcl_PrintDouble \- Convert floating value to string

.SH SYNOPSIS

.nf

\fB#include \fR

.sp

\fBTcl_PrintDouble\fR(\fIinterp, value, dst\fR)

.SH ARGUMENTS

.AS Tcl_Interp *interp

.AP Tcl_Interp *interp in

.VS

Before Tcl 8.0, the \fBtcl_precision\fR variable in this interpreter

controlled the conversion.  As of Tcl 8.0, this argument is ignored and

the conversion is controlled by the \fBtcl_precision\fR variable

that is now shared by all interpreters.

.VE

.AP double value in

Floating-point value to be converted.

.AP char *dst out

Where to store string representing \fIvalue\fR.  Must have at

least TCL_DOUBLE_SPACE characters of storage.

.BE

.SH DESCRIPTION

.PP

\fBTcl_PrintDouble\fR generates a string that represents the value

of \fIvalue\fR and stores it in memory at the location given by

\fIdst\fR.  It uses \fB%g\fR format to generate the string, with one

special twist: the string is guaranteed to contain either

a ``.'' or an ``e'' so that it doesn't look like an integer.  Where

\fB%g\fR would generate an integer with no decimal point, \fBTcl_PrintDouble\fR

adds ``.0''.

.SH KEYWORDS

conversion, double-precision, floating-point, string