Vector Program that Displays User Input into a table

#include <iostream>
#include <fstream>
#include <iomanip>
#include <vector>

using namespace std;


int main()
{
	
	int items;
	int index;   // counter for loops
	
	ifstream infile_weight; // pointer file for weight
	ifstream infile_rate; // pointer file for rate

	vector <double> weight (6); // vector with 6 elements
	vector <double> rate (6); 

	infile_weight.open("weight.dat",ios::in); // open file for input
	infile_rate.open("rate.dat",ios::in);
	
         cout << "How many packages do you want to enter? ";
	 cin >> items;
	 // resize to hold # of items user wants to enter
	 weight.resize(items);
	 rate.resize(items);
	 // loop to prompt user and index items
	 for (index = 0; index <=(items - 1); index++)
	 {
		cout << "Package # " << index + 1 << ":\n";
		cout << "How much does your package weigh? ";
		cin >> weight[index];
		cout << "What is the postage rate? ";
		cin >> rate[index];
	 }
	 
	 cout.setf(ios::showpoint);
         cout.setf(ios::fixed);
	 cout << setprecision(2);

	 cout << "Weight" << "     " << setw(10) << "Rate" <<  endl;
	 // print table
	 for (index = 0; index <=(items - 1); index++)
	 {
		 cout << weight[index] << setw (17) << rate[index] << endl;
	 }
	 infile_weight.close(); // closing files
	 infile_rate.close();
	 return 0;
}