Imports of package constant

PathSynopsis
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
go/tokenPackage token defines constants representing the lexical tokens of the Go programming language and basic operations on tokens (printing, predicates).
mathPackage math provides basic constants and mathematical functions.
math/bigPackage big implements arbitrary-precision arithmetic (big numbers).
strconvPackage strconv implements conversions to and from string representations of basic data types.
unicode/utf8Package utf8 implements functions and constants to support text encoded in UTF-8.