main

#include <iostream>
#include <string>
#include <fstream>
#include <cstdlib>

using std::string;
using std::cerr;
using std::endl;
using std::cin;
using std::cout;
using std::ifstream;

const string inFileName = "in.txt";
const string ERROR_NOT_NUMBER = "Error: must be integer!";
const string ERROR_FILE_NOT_OPEN = "Error: File not open";

void sort(int array[], int nArray);

int main()
{
	ifstream in;

	try
	{
		in.open("in.txt");
		if (!in)
			throw inFileName + ERROR_FILE_NOT_OPEN;

		int nArray = 0;
		in >> nArray;
		if (!in)
			throw inFileName + ERROR_NOT_NUMBER;

		int *array = new int[nArray];
		for (int i = 0; i < nArray; ++i)
		{
			in >> array[i];
			if (!in)
				throw inFileName + ERROR_NOT_NUMBER;
		}

		sort(array, nArray);

		delete[] array;
	}

	catch (const string & error)
	{
		cerr << endl << error << endl;
		return -1;
	}

	in.close();

	return 0;
}