XML : Issues using for loops in a C++ program tasked with finding the average of each of 6 specific lines containing 25 numeric values in an XML file

I am writing a program in C++ that is supposed to locate 6 specific lines in an XML file, each line individually holding 25 numeric values, and then find the average of those 25 numeric values for each line separately and output that average to the console window and to an output file. Additionally, I am supposed to extract the 6 time-stamps associated with those 6 specific lines. So far I have been able to implement regex to find and extract and output the 6 time-stamps with success. However, the function to find the average of the 25 numerical wattage/voltage values in each of the 6 lines outputs nothing, despite there being no compiler errors. I've tried to rubber ducky debug my code to no avail, and was hoping that a fresh pair of eyes could point out what I'm doing wrong.

Expected output:

2014-07-08T18:14:17.716Z

2014-07-08T18:14:18.716Z

2014-07-08T18:14:19.716Z

2014-07-08T18:14:20.716Z

2014-07-08T18:14:21.716Z

2014-07-08T18:14:22.716Z

Average Voltage: 3924.76

Average Voltage: 5793.68

Average Voltage: 7149.2

Average Wattage: 19425.5

Average Wattage: 8799.4

Average Wattage: 12602.9

Current Output:

http://imgur.com/JmKnF0o

XML file: http://pastebin.com/5hMy9RzK

  #include <fstream>  #include <string>  #include <iostream>  #include <regex>  void timestamps();  void voltAvg();  using namespace std;  float sum; //global variable  ifstream infile;  ofstream outFile;    int main(){  outFile.open("Outputdata.txt");  infile.open("Groupproject.xml"); // Opens the XML file containing the information that is to be read  if (infile.fail())  {      cout << "The file is not able to be located" << endl;      system("Pause");      exit(1);  }  timestamps();  voltAvg();  infile.close();  outFile.close();  system("pause");  return 0;  }      void timestamps() {  string fileinput;    regex time_regex("\\d\\d\\d\\d-\\d\\d-\\d\\d\\w\\d\\d:\\d\\d:\\d\\d\\.716Z");  smatch time_matches;        while (!infile.eof()) {  //Until the end of the file is reached, obtain each line      getline(infile, fileinput);        if (regex_search(fileinput, time_matches, time_regex)) { // if regex_search is able to locate a line which has elements matching the regex expression "time_regex" output the located element            cout << "Timestamp: " << time_matches[0] << endl;          outFile << "Timestamp: " << time_matches[0] << endl;  }    }    }    void voltAvg() {  float ave;  float dataValues;  int index;  string s;  string locateWord;    getline(infile, s); //gets first line of file  index = s.find(' '); //finds first white space  locateWord = s.substr(0, index); //cuts up line and assigns to locateWord  while (locateWord != "<VoltAmpereReactiveTimeSeries")  {      getline(infile, s);      index = s.find(' ');      locateWord = s.substr(0, index);    }      s = s.substr(index + 1, s.length());      infile.ignore(116, '\n'); // Ignores all of the stuff on the "<VoltAmpereReactiveTimeSeries" line and gets to the numbers on the subsequent line        for (int i = 0; i < 3; i++) {          for (int count = 0; count < 25; count++) //sums 25 voltage/wattage values          {              infile >> dataValues;//extract voltage data values from InFile              sum += dataValues;          }          ave = sum / 25.0; //calculate the average voltage          cout << "Average Voltage: " << ave  << endl;//outputs ave on screen          outFile << "Average Voltage: " << ave << endl; //Prints the average to out file          sum = 0; // re initialize sum           infile.ignore(176, '\n');         }      for (int j = 0; j < 3; j++) {           for (int countb = 0; countb < 25; countb++) //sums 25 voltage/wattage values          {              infile >> dataValues;//extract wattage data values from infile              sum += dataValues;          }          ave = sum / 25.0; //calculate the average wattage          cout << "Average Wattage: " << ave << endl;//outputs ave on screen          outFile << "Average Wattage: " << ave << endl; //Prints the average to out file          sum = 0; // re initialize sum           infile.ignore(176, '\n');        }  }