string with pointers

#include <iostream>
#include <string.h>

using namespace std;

main()
{
        char *p[6] = {"paper", "pen", "pencil", "book"};
        char *str;
        cout << "enter what you want to purchase? " << endl;
        cin >> str;
        for (int i = 0; i < 4; i++)
        {
                if(strcmp(*str, *p[i])==0)
                {
                        cout << "Available " << endl; 
                        break; }

                if(i == 4)
                {
                        cout << "NOT " << endl; }
        }
}