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)