Reverse an integer text input stream.

reverse_input.cpp

/*********************************************************************
 *  Compilation:  g++ -std=c++11 reverse.cpp -o reverse.exe
 *  Execution:    reverse.exe < input.txt
 *  
 *  Reverse an integer text input stream
 *  
 *  This is a toy code snippet for using C++11 types to handle
 *  an input stream, store the incoming data by line, and reverse
 *  it while printing to standard output.
 *  
 *  The to_int wrapper is because std::stoi would not be recognized
 *  by my compiler, even with the -std=c++11 flag.
 *
 *  The input file used for this came from 
 *  http://algs4.cs.princeton.edu/11model/tinyT.txt
 *  
 *  $ head tinyT.txt
 *    23
 *    50
 *    10
 *    99
 *    18
 *    23
 *    98
 *    84
 *    11
 *    10
 *  $ reverse.exe < tinyT.txt
 *    68 77 77 98 54 13 77 48 10 11 84 98 23 18 99 10 50 23
 *
 *********************************************************************/

#include <iostream> // std::cout, std::cin, std::getline
#include <string>   // std::string, std::stoi
#include <list>     // std::list
#include <cstdlib>  // atoi

int to_int(std::string s)
{
	return atoi(s.c_str());
}

int main ( )
{
	std::list<int> v;
	for (std::string s; std::getline(std::cin, s); )
	{
		int value = to_int(s);
		v.push_front(value);
	}
	
	for (auto itr = v.begin(), end = v.end(); itr != end; ++itr)
	{
		std::cout << *itr << " ";
	}
	std::cout << std::endl;
	
	return 0;
}