Initialize array members of a structure in a constructor

In this example from The C++ Programming Language 4th edition, chapter 8 I get error char[2] not assignable and char [5] not assignable. I'm using clang 4.9. What am I missing?

struct Address{
       string name;
       int number;
       string street;
       string town;
       char state[2];
       char zip[5];
       Address(const string n,int nu,const string & s,
                   const string& t,const string& st,int z);
};
Address::Address(const string n,int nu,const string & s,
                   const string& t,const string& st,int z)
     :name{n},
      number{nu},
      street{s},
      town{t}
{
  if(st.size()!=2)
        cout<<"state abbreviation should be two characters";
  state={st[0],st[1]};
  ostringstream ost;
  ost<<z;
  string zi{ost.str()};
  switch(zi.size()){
  case 5:
   zip={zi[0],zi[1],zi[2],zi[3],zi[4]};
  break;
  case 4:
   zip={'0',zi[0],zi[1],zi[2],zi[3]};
  break;
  default:
   cout<<"unexpected zip code format";
  }      
}