This command writes the specified objects to a single line
which is then written to a selected I/O stream.
Each element of the OBJECTS vector is first tested
if it is a name of a variable of any type. If it is
the contents of that variable is written out. If it is
not, the element is treated as a string constant.
The first and second element of NUMBER_PLACES set the
numbers of places before and after the decimal point,
respectively, for real and integer objects.
