构造函数

  1. string tmp_string(1, s[i]);

字符串流

  1. string helper(char c) {
  2.         string str;
  3.         stringstream stream;
  4.         stream << c;
  5.         str = stream.str();
  6.         return str;
  7.     }

push_back

  1. char character = 'T';
  2. string tmp_string;
  3. tmp_string.push_back(character);