Tcl_PrintDouble - Convert floating value to string

       Tcl_Interp *interp (in)          This argument is ignored.

       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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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”.

       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

Tcl                                                    8.0                                 Tcl_PrintDouble(3tcl)

       Tcl_PrintDouble - Convert floating value to string

#include<tcl.h>Tcl_PrintDouble(interp,value,dst)