Двойной стек

#include <iostream>
using namespace std;

#define max 6

struct stek {
    int top1, top2;
    int s[max];
};

void init(stek* st) {
    st->top1 = -1; st->top2 = max;
}

void inSt1(stek* st, int x) {
    if (st->top2 - st->top1 == 1)
        cout << "пепеполнение";
    else
        st->s[++st->top1] = x;
}

void inSt2(stek* st, int x) {
    if (st->top2 - st->top1 == 1)
        cout << "пепеполнение";
    else
        st->s[--st->top2] = x;
}

int outSt1(stek* st) {
    if (st->top1 == -1) {
        cout << "ты че доставать собрался";
        return 0;
    }
    else {
        return st->s[st->top1--];
    }
}

int outSt2(stek* st) {
    if (st->top2 == max) {
        cout << "ты че доставать собрался";
        return 0;
    }
    else {
        return st->s[st->top2++];
    }
}

void main() {
    stek* st = new(stek);
    init(st);

    inSt1(st, 5);
    inSt1(st, 6);
    inSt1(st, 7);
    inSt2(st, 10);
    inSt2(st, 11);
    inSt2(st, 12);

    cout << outSt1(st) << endl;
    cout << outSt2(st) << endl;
    cout << outSt1(st) << endl;
    cout << outSt2(st) << endl;
    cout << outSt1(st) << endl;
    cout << outSt2(st) << endl;

    cout << "---------------------" << endl;


    inSt1(st, 1);
    inSt1(st, 2);
    inSt1(st, 3);
    inSt1(st, 4);
    inSt1(st, 5);
    inSt1(st, 6);

    cout << outSt1(st) << endl;
    cout << outSt1(st) << endl;
    cout << outSt1(st) << endl;
    cout << outSt1(st) << endl;
    cout << outSt1(st) << endl;
    cout << outSt1(st) << endl;

    cout << "---------------------" << endl;

    inSt2(st, 10);
    inSt2(st, 11);
    inSt2(st, 12);
    inSt2(st, 13);
    inSt2(st, 14);
    inSt2(st, 15);

    cout << outSt2(st) << endl;
    cout << outSt2(st) << endl;
    cout << outSt2(st) << endl;
    cout << outSt2(st) << endl;
    cout << outSt2(st) << endl;
    cout << outSt2(st) << endl;


}