Unexpected Behav

//#define _GNU_SOURCE
#include<iostream>
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <string.h>
#include <vector>
using namespace std;

int main(int argc, char **argv)
{
	int iDeviceNum=0;
	string sDeviceName;
	//int iDeviceOutput=0;
	vector<float>vDeviceOutputs; // expressed in terms of outputs
	vector<string> DeviceNames;
	cout << "Enter a number for the amount of devices your person has" << endl;
	cin >> iDeviceNum;
	cout << "The amount of devices are: " << iDeviceNum << endl;

	cout<<"Enter the device Names here" << endl;
	/*for(int i=0;i<iDeviceNum;i++)
	{
		cin>>sDeviceName;
		DeviceNames.push_back(sDeviceName);
	}*/
	int i=iDeviceNum;
	while((cin>>sDeviceName) && (i>0))
	{
		DeviceNames.push_back(sDeviceName);
		i--;
		cout << "The value of i is: " << i << endl;
	}
	cout << "The actual device vector" << endl;
	for(unsigned int i=0;i<DeviceNames.size();i++)
	{
		cout<<DeviceNames[i]<<endl;
		cout<<"The value of i is: "<< i <<endl;
	}

}