Tcl_PrintDouble - Convert floating value to string
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
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