# include <iostream>
 # include <string>
 using namespace std;
 int main()
 {
     string a="dshifh";
     string b="djkhjdmds";
     cout<<a.length()<<endl;
     cout<<b.length()<<endl;
     cout<<a.size()<<endl;
     cout<<b.size()<<endl;
     return 0;
 }
为什么不能实现循环？