Why standard used in c++ yet not in c?

Answer 1

C has it own standarts (C90, C99, C11) just like C++99 and C++11.
edit:
my bad, c++98 is true, and yeah, there is c++11, and globally is used

Answer 2

There is no C++99 standard I know of. There's C++98 and C++03 (apart from the newer standards like C++11/14).