Debugging C++ file -

i getting error main.cpp:23:5: error: ‘department’ not name type

/*   * file:   main.cpp  * author: anonymous  *  * created on may 11, 2015, 9:44 pm  */  #include <cstdlib> #include <iostream>  using namespace std;  class college{     public :     string name; //for name of college     int numofcolleges;     int numdepartments; //number of departments in college     department* dep; //this point department in college     college* next; //the next pointer point next college     college(){         name =" ";          numdepartments=0 ;         dep = null;          next=null;}     college (string n, int numd ){name=n ;next=null;}     void print(){         cout<<name<<"\n";     }     };  class department { public: string name; int numofstudents; department* next; department(){name[0] ; numofstudents=0 ; next=null ;} department( string n , int nums){ name =" "; n ;numofstudents = nums ; next=null;} void print(){cout<<name<<" "<<numofstudents;} };  void addcollege(college *head)   {       string n;       int numd;       cout<<"enter name of college : ";       cin>>n;       cout<<"enter number of departments : ";       cin>>numd;       college* tmp = new college(n,numd);       if(!head)       {           head=tmp;           return;       }        college * t=head;        while(t->next) t=t->next;       t->next=tmp;       cout<<"college added"; }  void deletecollege(college*&head) {     string name;     cout<<"enter name of college:";     cin>>name;     if((!head)||(!head->next && head->name!=name))     {         cout<<"could not find "<<name<<" in list\n"; return;     }     if(head->next && head->name==name)     {         college *tmp=head;         head=head->next;         delete tmp;         tmp=null;         return;     }      college* tmp = head;     college* t;     while(tmp->next)     {         if(tmp->name==name)         {             college* tmp = head;              head = head->next;              delete tmp;         tmp->next=null;         }     if(tmp->next->name == name)     {     t = tmp->next;     tmp->next = tmp->next->next;     delete t;      return;     }     tmp=tmp->next;     }     cout<<"could not find "<<name<<" in list\n"; };  /*print list of colleges int college head*/ void printcolleges(college *head) {     cout<<"all colleges in database : \n";     college * temp = head;     while(temp!=null)     {     temp->print();     temp=temp->next;     } }  void adddepartment(college *head) {     if(!head)     {          cout<<"no colleges added!!";     return;     }      string n,dname;     int nums;      college* tmp = head;     college*tmp2 = tmp;     ;     while(tmp)     {         cout<<"->"<<tmp->name;         tmp=tmp->next;         cout<<endl;     }     cout<<"type college name add department inside\n";     cin>>n;     cout<<"enter department name:";     cin>>dname;     cout<<"enter number of students :";     cin>>nums;      while(n!=tmp->name)     {         tmp=tmp->next;     }      if(!tmp-> dep)     {         college * tmpd = new department(dname,nums);         department*tmpdd = tmpd;         head=tmp;         return;     }       /*if(tmp->dep)     {         department *tmp3 = tmp->dep->next;         t=tmp->dep;         dep->next=tmp3;     }*/  };  //void deletedepartment(college* head) //{ // // // ;}  void printall(college*head) {     college * temp = head;     while(temp!=null)     {     temp->print();     temp=temp->next;     }  };   int main(int argc, char** argv) {     int choice;     college*h = null;      while(choice!=11){         cout<<"\n\nmenu\n";         cout<<"1: add new college in list  \n";         cout<<"2: delete college list \n";         cout<<"3: add department in college\n";         cout<<"4: delete department college.\n";         cout<<"5: print colleges along departments\n ";         cout<<"6: delete departments of particular college \n";         cout<<"7: delete colleges list.\n";         cout<<"8: print total number of students in college.\n";         cout<<"9: find , print college has highest number of students. \n";         cout<<"10: find , print department has highest number of students.\n";         cout<<"exit\n";         cin>>choice;         switch(choice)         {          case 1: addcollege(*&h);         break;          case 2: deletecollege(*&h);         break;          case 3: printcolleges(*&h);         break;         case 4:             adddepartment(*&h);         break;         /* case 4:       deletedepartment(*&h);        break;       case 5:        printall(*&h);      break;         case 6:          deletedepartment(*&h);     break;          case 7:         deleteallcolleges(*&h);          break;           case 8:        numofstudentsincollege(*&h);          break;         case 9:         highestnumofstudentsincollege(*&h);          break;         case 10:         highestnumofstudentsindep(*&h);         break;         case 11:         cout<<"bye";          break;*/          default:          cout<<"\ninvalid menu choice";         }     } } 

declare department class before it's called in college. (move department declaration above college declaration):

class department {  public:  string name;  int numofstudents;  department* next;  department(){name[0] ; numofstudents=0 ; next=null ;}  department( string n , int nums){ name =" "; n ;numofstudents = nums  ; next=null;}  void print(){cout<<name<<" "<<numofstudents;}  };  class college{ public : string name; //for name of college int numofcolleges; int numdepartments; //number of departments in college department * dep; //this point department in college college * next; //the next pointer point next college college(){     name =" ";     numdepartments=0 ;     dep = null;     next=null;} college (string n, int numd ){name=n ;next=null;} void print(){     cout<<name<<"\n"; } };