1.5

// 1.5.cpp: определяет точку входа для консольного приложения.
//

#include "stdafx.h"
#include <math.h>
#include <iostream>
#include <fstream>

/*
Во входном массиве – целые числа. Поместить в выходной файл только простые числа
*/

using namespace std;

int Prime(unsigned long a);
bool read_write(char *f_ioput, int *ioput_mas, bool flag);
int main()
{
	char *f_in = new char[64];
	char *f_out = new char[64];
	int *mas = new int[256];
	int *o_mas = new int[256];
	cout << "Vvedite INPUT FILE with format(example: input.txt)" << endl;
	cin >> f_in;
	cout << "Vvedite OUTPUT FILE with format(example: output.txt)" << endl;
	cin >> f_out;
	if (read_write(f_in, mas, 1)) {
		int j = 0;
		int i = 0;
		while (mas[i] != '\0') {
			if (Prime((unsigned long)mas[i])) {
				o_mas[j] = mas[i];
				j++;
			}
			i++;
		}
		read_write(f_out, o_mas, 0);
	}

    return 0;
}

int Prime(unsigned long a)
{
	unsigned long i1, i2, i3, i4, i5, i6, i7, i8, bound;
	if (a == 0 || a == 1)
		return 0;
	if (a == 2 || a == 3 || a == 5 || a == 7 || a == 11 || a == 13 || a == 17 || a == 19 || a == 23 || a == 29)
		return 1;
	if (a % 2 == 0 || a % 3 == 0 || a % 5 == 0 || a % 7 == 0 || a % 11 == 0 || a % 13 == 0 || a % 17 == 0 || a % 19 == 0 || a % 23 == 0 || a % 29 == 0)
		return 0;
	bound = sqrt((double)a);
	i1 = 31; i2 = 37; i3 = 41; i4 = 43; i5 = 47; i6 = 49; i7 = 53; i8 = 59;
	while (i8 <= bound && a%i1 && a%i2 && a%i3 && a%i4 && a%i5 && a%i6 && a%i7 && a%i8)
	{
		i1 += 30; i2 += 30; i3 += 30; i4 += 30; i5 += 30; i6 += 30; i7 += 30; i8 += 30;
	}
	if (i8 <= bound ||
		i1 <= bound && a % i1 == 0 ||
		i2 <= bound && a % i2 == 0 ||
		i3 <= bound && a % i3 == 0 ||
		i4 <= bound && a % i4 == 0 ||
		i5 <= bound && a % i5 == 0 ||
		i6 <= bound && a % i6 == 0 ||
		i7 <= bound && a % i7 == 0)
		return 0;
	return 1;
}
bool read_write(char *f_ioput, int *ioput_mas, bool flag) {
	int n = 0;
	if (flag) {
		ifstream fin(f_ioput);
		if (fin) {
			while (!fin.eof()) {
				fin >> ioput_mas[n];
				n++;
			}
			fin.close();
			return 1;
		}
		else {
			cout << "ERROR: DON'T OPEN " << f_ioput << "!" << endl;
			return 0;
		}
	}
	else {
		ofstream fout(f_ioput);
		if (fout) {
			for (int i = 0; i < sizeof(ioput_mas[i]);i++){
				fout << ioput_mas[i] << " ";
			}
			return 1;
		}
	}
	return 0;
}