c++ - Inputting and Outputting Data from file in Vector Error? -

i new c++ , not sure why output file blank. think might have functions? when put code main , not function, output file give me information.. not sure doing wrong.

#include <iostream> #include <fstream> #include <cstdlib> #include <iomanip> #include <vector>  #define die(msg) {cerr << msg << endl; exit(1);}  using namespace std;  struct eip {     string block;     string blksfx;     string lot;     string lotsfx; };  void inputdata(fstream &, vector<eip>); void outputdata(fstream &, vector<eip>);  int main() {     fstream fs("book1.txt", ios::in);     fstream fsout("securedeip.txt", ios::out);      if(!fs.is_open()) die("can not open book1.txt!");     if(!fsout.is_open()) die("can not open securedeip.txt!");      vector<eip> name;      inputdata(fs, name);     outputdata(fsout, name);      fs.close();     fsout.close();     return(0); }  void inputdata(fstream &fs, vector<eip> name) {     while(fs) {         eip temp;         getline(fs, temp.block, '\t');         getline(fs, temp.blksfx, '\t');         getline(fs, temp.lot, '\t');         getline(fs, temp.lotsfx, '\n');          name.push_back(temp);     } }  void outputdata(fstream &fsout, vector<eip> name) {     for(int = 1; < name.size(); i++) {         fsout << setw(4) << setfill('0');         fsout << name[i].block;          if(name[i].blksfx == "")             fsout << " ";         else             fsout << name[i].blksfx;          fsout << setw(3) << setfill('0');         fsout << name[i].lot;          if(name[i].lotsfx == "")             fsout << "  " << endl;         else             fsout << name[i].lotsfx << " " << endl;     } } 

here data text file.

3965    1    837     9    3749    59   3752    19   3532    54   6769    49   535     10   819     13  b 3616    84   26      30   3732    8    3732    150  6536    8    71      2    

you passing copies of vector inputdata/outputdata - make these references instead, i.e. change:

void inputdata(fstream &fs, vector<eip> name) 

and

void outputdata(fstream &fsout, vector<eip> name) 

to:

void inputdata(fstream &fs, vector<eip> &name) 

and

void outputdata(fstream &fsout, vector<eip> &name)