//
// example of recursion:
//
// 	function to print file in line-by-line reverse order
//
// main (test) program obtains filename from first command-line argument
//
#include <iostream.h>
#include <fstream.h>
#include <string>
#include <stdlib.h>

// precondition:  file has been successfully opened
// postcondition:  remaining contents of file have been printed in
//	reverse order (line by line)
void reverse_file(ifstream& file);

// ---- main program ----

int main(int argc, char *argv[])
{
	ifstream file;
	if (argc < 2)
	{
		cout << "Usage is:  reverse_file filename.\n";
		exit(1);
	}
	file.open(argv[1]);
	if (file.fail())
	{
		cout << "Unable to open file " << argv[1] << endl;
		exit(1);
	}
	reverse_file(file);
	file.close();
	return 0 ;
}

// ---- function definition ----

void reverse_file(ifstream& file)
{
	string line;
	if (getline(file, line))
	{
		reverse_file(file);
		cout << line << endl;
	}
	return;
}