VULab1

#include <stdio.h>
#include <conio.h>

typedef struct {
    int first, second;
} range;

void input(range *ob)
{
    printf("Input first second: "); scanf("%d %d", &ob->first, &ob->second);
}

int check(range ob)
{
    return ob.first < ob.second ? 1 : 0;
}

void output(int in_range, range ob)
{
    printf("%s [%d;%d).\n", in_range == 0 ? "Out off range" : "In range", ob.first, ob.second);
}

int is_in_range(int pnt, range ob)
{
    return (pnt >= ob.first && pnt < ob.second) ? 1 : 0;
}

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

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

    for (i = u.first; i < u.second; i++) printf("%d ", i);
    putchar('\n');
}

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

    input(&ob1);
    input(&ob2);

    if (!check(ob1)) printf("Range [%d;%d) is incorrect.\n", ob1.first, ob1.second);
    if (!check(ob2)) printf("Range [%d;%d) is incorrect.\n", ob2.first, ob2.second);

    printf("input num: "); scanf("%d", &t);

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

    rangePrintUnion(ob1, ob2);

    getch();
}