Reading Numbers from a Text File and removing leading zeros Using C++

A program in C++ written by my friend Tom to read a series of numbers from a text file and removing leading zeros.

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Program Listing

main.cpp

#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <sstream>

using namespace std;

void process_line(string& line);
vector<string> process_lines(const std::string& filename);
void output_lines(std::vector<std::string> &lines);

int main()
{
   vector<string> lines = process_lines("input.txt");
   output_lines(lines);
}

vector<string> process_lines(const std::string& filename)
{
   vector<string> lines;
   string line;

   ifstream src(filename);
   while (getline(src, line))
   {
     process_line(line);
     lines.push_back(line);
   }
   return lines;
}

void process_line(string& line)
{
   istringstream iss(line);
   ostringstream oss;
   int num;

   while(iss >> num)
     oss << num << ' ';

   line = oss.str();
}

void output_lines(std::vector<std::string> &lines)
{
   cout << "Output numbers without leading zeros\n";
   for (const string& s : lines)
     cout << s << '\n';
}

input.txt

1 2 3 4 5 6 7 8 9 10
01 002 03 0004 005 006 007 00008 0009 010