单项选择题
A.10 B.20 C.30 D.10,20,30
A.int s=26,this=30; B.int _s1=25,-s2=100; C.int n;cin>>n;int arr[n]; D.char str[]={"I am a student"};
A.p++; B.hh++; C.(*p)++; D.(*hh)++