printingSeparator = s
i1 : 3000000000000. o1 = 3e12 o1 : RR (of precision 53)
i2 : printingSeparator o2 = e
i3 : printingSeparator = "E" o3 = E
i4 : 3000000000000. o4 = 3E12 o4 : RR (of precision 53)
The object printingSeparator is a string.