下列语句 #include <iostream> using namespace std; void main() cout<<100.8989663<<''; cout<<fixed<<100.8989663<<''; cout<<scientific<<100.8989663<<''; 的输出结果为( )。
A.100.899 100.898966 1.008990e+002
B.100.8989663 100.898966 1.008990e+002
C.100.899 100.898966 1.008989e+002
D.100.899 100.8989663 1.008989e+002