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Runtime terminated in an unusual way?

CyberBrain (3)
I'm having a problem running a simple program I made to read Gcode.
When I try to run the program it freezes up and windows says the program terminated itself in an unusual way, while my compiler doesn't seem to detect an error.
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#include <windows.h>
#include <gl/gl.h>
#include <fstream>
#include <string>
#include <sstream>
#include <stdlib.h>
#include <cmath>
using namespace std;

/**************************
 *Gcode reader
 *
 **************************/

float xco1=0.0f;
float yco1=0.0f;
float zco1=0.0f;
float xco2=0.0f;
float yco2=0.0f;
float zco2=0.0f;

int gcodereader(){
    bool spot = false;
    xco1=xco2;
    yco1=yco2;
    zco1=zco2;
    ifstream file1;
    string gcodeline;
    string code1;
    string code2;
    string code3;
    size_t found;
    int found2;
    int clength;
    file1.open("file1.txt", ios::in | ios::binary);
    if (file1.is_open()){
                         if(mode1==true){
                                         getline(file1, gcodeline, '\n');
                                         }
                         
                         while (file1.good()){
                               xco1=xco2;
                               yco1=yco2;
                               zco1=zco2;
                               getline(file1, gcodeline);
                               
                               if (spot==false){
                                  found=gcodeline.find('y');
                                  if (found!=string::npos){
                                                           spot = true;
                                                           if(found!=0){
                                                                        found2 = found;
                                                                        while(found2 < gcodeline.length()){
                                                                                     found2 += 1;
                                                                                     code2 += gcodeline[found2];
                                                                                     }
                                                                     
                                                                     gcodeline.erase(found, (gcodeline.length()-found));
                                                                     }
                                                                     code2.erase((code2.length()-1));
                                                                     istringstream codeConversion(code2);
                                                                     codeConversion >> yco2;
                                                                     }
                                                           }
                               if (spot==false){
                                  found=gcodeline.find('x');
                                  if (found!=string::npos){
                                                           spot = true;
                                                           if(found!=0){
                                                                        found2 = found;
                                                                        while(found2 < gcodeline.length()){
                                                                                     found2 += 1;
                                                                                     code2 += gcodeline[found2];
                                                                                     }
                                                                     
                                                                     gcodeline.erase(found, (gcodeline.length()-found));
                                                                     }
                                                                     code2.erase((code2.length()-1));
                                                                     istringstream codeConversion(code2);
                                                                     codeConversion >> xco2;
                                                                     }
                                                           }
                               if (spot==false){
                                  found=gcodeline.find('z');
                                  if (found!=string::npos){
                                                           spot = true;
                                                           if(found!=0){
                                                                        found2 = found;
                                                                        while(found2 < gcodeline.length()){
                                                                                     found2 += 1;
                                                                                     code2 += gcodeline[found2];
                                                                                     }
                                                                     
                                                                     gcodeline.erase(found, (gcodeline.length()-found));
                                                                     }
                                                                     code2.erase((code2.length()-1));
                                                                     istringstream codeConversion(code2);
                                                                     codeConversion >> zco2;
                                                                     }
                                                           }
                               if (gcodeline[0]=='z'){
                                                      gcodeline.erase(0, 1);
                                                      istringstream codeConversion(gcodeline);
                                                      codeConversion >> zco2;
                                                      }
                               if (gcodeline[0]=='x'){
                                                      gcodeline.erase(0, 1);
                                                      istringstream codeConversion(gcodeline);
                                                      codeConversion >> xco2;
                                                      }
                               if (gcodeline[0]=='y'){
                                                      gcodeline.erase(0, 1);
                                                      istringstream codeConversion(gcodeline);
                                                      codeConversion >> yco2;
                                                      }
                               
                               glColor4f(0.0f, 0.0f, 1.0f, 0.6f);
                               if(zco2 == 0.0f){
                                       glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
                                       }
                               zco2 = zco2/20;
                               xco2 = xco2/20;
                               yco2 = yco2/20;
                               
                               zco2 = zco2+zco1;
                               xco2 = xco2+xco1;
                               yco2 = yco2+yco1;
                               
                               glBegin(GL_LINES);
                               glVertex3f(xco1, yco1, zco1);
                               glVertex3f(xco2, yco2, zco2);
                               glEnd();
                               }
                         file1.close();
                         }
    
    else{
         file1.close();
    }
}

This is the function that's supposed to display the Gcode in opengl.

Please help
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