Reading Files into Vector

Thought of this while trying to create a parser. The intention is to read a complete text file into a vector and then use this vector for other operations. This program shows how to read from a text file into vectors.

The input file is as follows:

Line num 1

Another line

Line number 3

4th Line!

**%** Last line **%**

Program as follows:

//Program tested on Microsoft Visual Studio 2008 - Zahid Ghadialy
#include <iostream>
#include <vector>
#include <fstream>
#include <string>

using namespace std;

int main()
{
 vector<std::string> lines;
 lines.reserve(5000); //Assuming that the file to read can have max 5K lines

 string fileName("test.txt");

 ifstream file;
 file.open(fileName.c_str());

 if(!file.is_open())
 {
   cerr<<"Error opening file : "<<fileName.c_str()<<endl;
   return -1;
 }

 //Read the lines and store it in the vector
  string line;
 while(getline(file,line))
 {
   lines.push_back(line);
 }

 file.close();

 //Dump all the lines in output
  for(unsigned int i = 0; i < lines.size(); i++)
 {
   cout<<i<<". "<<lines[i]<<endl;
 }

 return 0;
}

Output as follows: