Help with error: invalid use of member (did you forget the '&' ?)

HI. I'm new to programming. can someon help me explain this error?

insert

Code:

//Jeff Chhouk
//Package Shipping Project
#include <iostream>
using namespace std;

class Package// declare base class


{
private:
public:
   Package(char *, char *);  //constructor
  ~Package(); //destructor
   virtual float calcShipcost()=0;  //zero to make abstract
   virtual void print()=0;
protected:   

char *first, *last;  //for first and last name

   int Numofitems;
   int overnightd();
   int insurance();
   
};


Package :: Package(char *f, char *l)
{
first=new char[strlen(f)+1];
strcpy(first, f);
last= new char [strlen(l)+1];
strcpy(last, l);
}

Package::~Package() // using destructor
{
  delete[] first;
  delete[] last;
}

void Package:: print()
{ 
   cout<< first<< "  " << last;
}





class Tshirts : public Package // declaring derived class of tshirts with base class of Package

{




public:
   Tshirts();// constructor
  ~Tshirts(); //destructor
  virtual float calcShipcost();
};

float Tshirts:: calcShipcost()
{

  if(overnightd==1 && insurance==1 )//zero no and one is yes
 return (Numofitems*2.75)+10+(.02*(Numofitems*2.75));//for yes on insuranances and yes delivery
   
else  if      (overnightd==1 && insurance==0)
   return (Numofitems*2.75)+10;
 else  if    (overnightd==0  && insurance==1)
     return(Numofitems*2.75)+(.02*(Numofitems*2.75)) ;
else   
    (overnightd==0 && insurance==0)
     return(Numofitems*2.75) ;
      
}

Void Tshirts:: print()
]{
cout<<"T shirts cost is:";
Package::print();
}



int main
{

Tshirt tees("Joe", "Smith" 2,1,0);
tees.print();//T shirts cost is:$15.50
cout<<"$"<<tees.calc Shipcost()<<endl;


system("PAUSE");// must be before return 0
return o;
}

Output:
t.cpp: In member function 'virtual float Tshirts::calcShipcost()':
Line 66: error: invalid use of member (did you forget the '&' ?)
compilation terminated due to -Wfatal-errors.


I bold the error line.

You defined overnight as a function pointer. If you intended to call the function, then you should use the function call notation (that is, a set of parentheses afterward). Same for insurance.

Thank you! I took the parentheses out.