problem with swapping values in array

[chofs]

hey guys am trying to swap numbers within my array but i keep getting the same number from text file not been swapped.....please help....ignore my print function.....thanx in advance

#include <iostream>
#include <vector>
#include <fstream>
#include <cmath>
#include <algorithm>


using namespace std;

void getvaluesfromfile(vector<int>&NUMBER)
{
   int number=0;
   ifstream infile("indata.txt");

   while(infile>>number)
   {
       NUMBER.push_back(number);
   }
}
/*void print(vector<int>&NUMBER)
{
    int decoy;
    decoy=NUMBER[0];

    int n1,n2,n3,n4;

    n1=decoy%10;
    n2=(decoy/10)%10;
    n3=(decoy/100)%10;
    n4=(decoy/1000)%10;

    NUMBER.push_back(n4);
    NUMBER.push_back(n3);
    NUMBER.push_back(n2);
    NUMBER.push_back(n1);
    //cout<<NUMBER[0];


}*/
   void swapfunction(vector<int>&NUMBER)
   {

       int decoy;
    decoy=NUMBER[0];

    int n1,n2,n3,n4;

    n1=decoy%10;
    n2=(decoy/10)%10;
    n3=(decoy/100)%10;
    n4=(decoy/1000)%10;

    NUMBER.push_back(n4);
    NUMBER.push_back(n3);
    NUMBER.push_back(n2);
    NUMBER.push_back(n1);
       const int SIZE=4;
       int digit[SIZE]={n4,n3,n2,n1};

       swap(digit[0],digit[2]);


       cout<<NUMBER[0];


   }


int main()
{
    vector<int> NUMBER;
    getvaluesfromfile(NUMBER);
    //print(NUMBER);
    swapfunction(NUMBER);
}