with (other) {
       instance_change(obj_block);
}

#include <iostream>
#include <math.h>
using namespace std;

int a, c;
double b, d;

int main() {
       setlocale(0,"Russian");
       while (true) {
           do {
               cout << "Введите A, B, C: \n";
               cin >> a >> b >> c;
               if (a <= 0)
                   cout << "A (" << a << ") <= 0.";
           }
           while (a <= 0);

           d = b * b - 4 * a * c;
           if (!d)
               cout << "x = " << -b / (2 * a) << endl;
           else if (d < 0)
               cout << "Решений нет!\n";
           else {
               d = sqrt(d);
               cout << "x1 = " << (-b + d) / (2 * a) << endl;
               cout << "x2 = " << (-b - d) / (2 * a) << endl;
           }
       }
       return 0;
}

if (door1 == 1) {
        show_message("Не хватает предмета, синий контракт");
        door1 = 0;
}

with (o_block) {
       instance_destroy();
}

with (other) {
       instance_destroy();
}

       instance_destroy();

var i;
i = choose(obj1, obj2, obj3);
instance_create(x, y, i);