int main(){

string name;

cout << "please enter yourname:";

getline(cin, name);

if (name.empty())

{

cout << "your name is null" <<endl;

system("pause");

return 0;

}

if (name == "imooc")

cout << "you are a adminisriter" << endl;

cout << "hello" + name << endl;

cout << "the first letter of your name is:" << name[0] << endl;

cout << "the length of your name :" << name.size() << endl;

system("pause");

return 0;

}