std::string

1. string 字符操作

  string ss = "abc";
  ss += (char)0x45;
  ss += "d";
  cout << "ss:" << ss<<endl;
  for (int i=0; i<ss.size(); ++i)
  if (ss[i] == 0x45)
    cout <<"i:" <<i <<endl;    //输出3