VULab1cpp

#include <iostream>
using namespace std;

struct range{
    int first, second;

    void input(){cout << "Input first second: "; cin >> first >> second;}
    int check(){ return first < second ? 1 : 0; }
    void output(int in_range){cout << (in_range == 0 ? "Out off range" : "In range") << "[" << first << ";" << second <<").\n";}
    int is_in_range(int pnt){return (pnt >= first && pnt < second) ? 1 : 0;}
    static void rangePrintUnion(range ob1, range ob2);
};

void range::rangePrintUnion(range ob1, range ob2)
{
    int i;
    range u;

    if (ob1.is_in_range(ob2.first) && ob1.is_in_range(ob2.second)) {
        u = ob1;
    }
    else if (ob2.is_in_range(ob1.first) && ob2.is_in_range(ob1.second))
    {
        u = ob2;
    }
    else if (ob1.is_in_range(ob2.second)) {
        u.first = ob2.first;
        u.second = ob1.second;
    }
    else if (ob1.is_in_range(ob2.first))
    {
        u.first = ob1.first;
        u.second = ob2.second;
    }
    else
    {
        u = ob2;
        for (i = ob1.first; i < ob1.second; i++) cout << i << " ";
    }

    for (i = u.first; i < u.second; i++) cout << i << " ";
    cout << endl;
}

void main()
{
    int t;
    range ob1, ob2;

    ob1.input();
    ob2.input();

    if (!ob1.check()) cout << "Range [" << ob1.first << ";" << ob1.second << ") is incorrect.\n";
    if (!ob2.check()) cout << "Range [" << ob2.first << ";" << ob2.second << ") is incorrect.\n";

    cout << "input num: "; cin >> t;

    ob1.output(ob1.is_in_range(t));
    ob2.output(ob2.is_in_range(t));

    ob1.rangePrintUnion(ob1, ob2);

    cin.ignore();
    cin.get();
}