read from .txt the third coordinate using c++ -

i have .txt file real coordinates of points. scenario camera facing wall; between them have box. want in .txt points refering box, want read third component coordinates, meaning depth value , if it's bigger distance supprime line.

file.txt

0.005545 0.06564 1.6354

0.235443 0.35464 2.6575

if(value>2.5) { delete line .txt }

all coordinates separated white space , lines intro.

thanks

i think work:

#include <fstream> #include <vector> #include <iterator> #include <algorithm>  #define thresh 2.5f  using namespace std; int main() {     vector<float> dataarray;      ifstream myfile("test.txt");       copy(istream_iterator<float>(myfile),          istream_iterator<float>(),          back_inserter(dataarray));     myfile.close();      ofstream newfile("test.txt");      for(int = 2; < dataarray.size(); += 3)     {         if(dataarray[i] < thresh)         {             (int j = i-2; j <= i; ++j)                 newfile << dataarray[j] << "  ";             newfile << endl;         }     }      myfile.close();      return 0; }