Tcl_PrintDouble — Convert floating value to string
#include <tcl.h>
Tcl_PrintDouble(interp, value, dst)
- 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.
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.
conversion, double-precision, floating-point, string
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