#include
     
      #include
      
       using namespace std;void main(){    string str1("i am here!");    string str2="where are you?";    cout << str1[0] << str1[9] << "," << str1 << endl;    cout << str2[0] << str2[13] << "," << str2 << endl;    cout << "please input you name:";    cin >> str1;    cout << str1 << endl;    cout << "length of the name is :" << str1.size() << endl;    cout << str2 + " " + str1 << endl;}
      
     

输出结果

 

end!