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46 lines
1.5 KiB
Groff
46 lines
1.5 KiB
Groff
'\"
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'\" Copyright (c) 1989-1993 The Regents of the University of California.
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'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
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'\"
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'\" See the file "license.terms" for information on usage and redistribution
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'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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'\"
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'\" SCCS: @(#) PrintDbl.3 1.6 96/03/25 20:05:45
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'\"
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.so man.macros
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.TH Tcl_PrintDouble 3 7.0 Tcl "Tcl Library Procedures"
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.BS
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.SH NAME
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Tcl_PrintDouble \- Convert floating value to string
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.SH SYNOPSIS
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.nf
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\fB#include <tcl.h>\fR
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.sp
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\fBTcl_PrintDouble\fR(\fIinterp, value, dst\fR)
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.SH ARGUMENTS
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.AS Tcl_Interp *interp
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.AP Tcl_Interp *interp in
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Interpreter that controls the conversion.
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.AP double value in
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Floating-point value to be converted.
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.AP char *dst out
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Where to store string representing \fIvalue\fR. Must have at
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least TCL_DOUBLE_SPACE characters of storage.
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.BE
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.SH DESCRIPTION
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.PP
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\fBTcl_PrintDouble\fR generates a string that represents the value
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of \fIvalue\fR and stores it in memory at the location given by
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\fIdst\fR. It uses %g format to generate the string, with two
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special twists. First, the string is guaranteed to contain either
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a ``.'' or an ``e'' so that it doesn't look like an integer (where
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%g would generate an integer with no decimal point, \fBTcl_PrintDouble\fR
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adds ``.0''). Second, the number of significant digits printed at
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\fIdst\fR is controlled by the \fBtcl_precision\fR variable in
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\fIinterp\fR; if \fBtcl_precision\fR is undefined then 6 significant
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digits are printed.
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.SH KEYWORDS
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conversion, double-precision, floating-point, string
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