Remove warning of deprecated conversion from string constant to 'char*

Question

I have written a code like bill payment. Code is working fine but there are many warnings in my code which I want to remove. One of the most frequent warning is deprecated conversion from string constant to 'char* . I have tried many things and some of the warnings are gone but not all. Please anybody point out at my mistakes??

P.S: I have already tried replacing char* to const char* , but then I am not able to exchange or swap values and it was causing error. Any other solution??

Below is the code

#include<iostream>
#include<string.h>
using namespace std;

class item
{
    private:
        int barcode;
        char* item_name;

    public:
        item (int num=0, char* name="NULL") : barcode(num)
        {
            item_name=new char[strlen(name)+1];
            strcpy(item_name,name);
        }
        void setbarcode(int num)
        {
            barcode=num;
        }
        int getbarcode()
        {
            return barcode;
        }
        void scanner()
        {
            int num;
            cin>>num;
            setbarcode(num);
        }
        void printer()
        {

            cout <<"\nBarcode"<<"\t\t"<<"Item Name"<<"\t\t"<<"Price"<<endl;
            cout <<barcode<<"\t\t"<<item_name<<"\t\t\t";
        }
        ~item()
        {
            delete[]item_name;
        }
};

class packedfood : public item
{
    private :
        int price_per_piece;

    public :
        packedfood(int a=0, int num=0, char* name = "NULL") : price_per_piece(a),item(num,name)
        {
        }

    void setprice(int num)
    {
        price_per_piece=num;
    }   
    int getprice()  
    {
        return price_per_piece;
    }   

    void scanner()
    {
        item::scanner();
    }

    void printer()  
    {
        item::printer();
        cout<<getprice()<<"  Per Piece";
    }   
    ~packedfood()
    {
    }   
};

class freshfood: public item
{
    private:
        int price_per_rupee;
        float weight; 

    public:
        freshfood(float b=0, int a=0,int num=0,char* name="NULL") : weight(b),price_per_rupee(a),item(num,name)
        {
        }
    void setweight(float b)
    {   
        weight=b;
    }
    int getweight()
    {
        return weight*50;
    }
    void printer()
    {
        item::printer();
        cout<<getweight()<<" Per Rupee"<<endl<<endl;    
    }
    void scanner()
    {
        item::scanner();
    }
    ~freshfood()
    {
    }
};  

int main()
{
    item x(389,"Anything");
    item y;
    packedfood m(10,118,"Chocolate");
    packedfood n;
    freshfood r(20.9,93,357,"Fruits");
    freshfood s;

    cout <<"\n\n Enter the Barcode for Packed food : ";
    m.scanner();
    m.printer();

    cout <<"\n\n Enter the Barcode for Fresh food : ";
    r.scanner();
    r.printer();    

    system("PAUSE");
    return 0;
}